diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 13:50:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-12 13:50:21 -0800 |
| commit | 6bec0035286119eefc32a5b1102127e6a4032cb2 (patch) | |
| tree | 440fab001b4c877b0b0c9fd62d8392e956e387e3 | |
| parent | 5d8e7fb6916556e9b476de33404e8c9e2c9aee61 (diff) | |
| parent | 15d0f5ea348b9c4e6d41df294dde38a56a39c7bf (diff) | |
| download | op-kernel-dev-6bec0035286119eefc32a5b1102127e6a4032cb2.zip op-kernel-dev-6bec0035286119eefc32a5b1102127e6a4032cb2.tar.gz | |
Merge branch 'for-3.20/bdi' of git://git.kernel.dk/linux-block
Pull backing device changes from Jens Axboe:
"This contains a cleanup of how the backing device is handled, in
preparation for a rework of the life time rules. In this part, the
most important change is to split the unrelated nommu mmap flags from
it, but also removing a backing_dev_info pointer from the
address_space (and inode), and a cleanup of other various minor bits.
Christoph did all the work here, I just fixed an oops with pages that
have a swap backing. Arnd fixed a missing export, and Oleg killed the
lustre backing_dev_info from staging. Last patch was from Al,
unexporting parts that are now no longer needed outside"
* 'for-3.20/bdi' of git://git.kernel.dk/linux-block:
Make super_blocks and sb_lock static
mtd: export new mtd_mmap_capabilities
fs: make inode_to_bdi() handle NULL inode
staging/lustre/llite: get rid of backing_dev_info
fs: remove default_backing_dev_info
fs: don't reassign dirty inodes to default_backing_dev_info
nfs: don't call bdi_unregister
ceph: remove call to bdi_unregister
fs: remove mapping->backing_dev_info
fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
nilfs2: set up s_bdi like the generic mount_bdev code
block_dev: get bdev inode bdi directly from the block device
block_dev: only write bdev inode on close
fs: introduce f_op->mmap_capabilities for nommu mmap support
fs: kill BDI_CAP_SWAP_BACKED
fs: deduplicate noop_backing_dev_info
87 files changed, 305 insertions, 704 deletions
diff --git a/Documentation/nommu-mmap.txt b/Documentation/nommu-mmap.txt index 8e1ddec..ae57b9e 100644 --- a/Documentation/nommu-mmap.txt +++ b/Documentation/nommu-mmap.txt @@ -43,12 +43,12 @@ and it's also much more restricted in the latter case: even if this was created by another process. - If possible, the file mapping will be directly on the backing device - if the backing device has the BDI_CAP_MAP_DIRECT capability and + if the backing device has the NOMMU_MAP_DIRECT capability and appropriate mapping protection capabilities. Ramfs, romfs, cramfs and mtd might all permit this. - If the backing device device can't or won't permit direct sharing, - but does have the BDI_CAP_MAP_COPY capability, then a copy of the + but does have the NOMMU_MAP_COPY capability, then a copy of the appropriate bit of the file will be read into a contiguous bit of memory and any extraneous space beyond the EOF will be cleared @@ -220,7 +220,7 @@ directly (can't be copied). The file->f_op->mmap() operation will be called to actually inaugurate the mapping. It can be rejected at that point. Returning the ENOSYS error will -cause the mapping to be copied instead if BDI_CAP_MAP_COPY is specified. +cause the mapping to be copied instead if NOMMU_MAP_COPY is specified. The vm_ops->close() routine will be invoked when the last mapping on a chardev is removed. An existing mapping will be shared, partially or not, if possible @@ -232,7 +232,7 @@ want to handle it, despite the fact it's got an operation. For instance, it might try directing the call to a secondary driver which turns out not to implement it. Such is the case for the framebuffer driver which attempts to direct the call to the device-specific driver. Under such circumstances, the -mapping request will be rejected if BDI_CAP_MAP_COPY is not specified, and a +mapping request will be rejected if NOMMU_MAP_COPY is not specified, and a copy mapped otherwise. IMPORTANT NOTE: diff --git a/block/blk-core.c b/block/blk-core.c index 3ad4055..928aac29 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -607,7 +607,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) q->backing_dev_info.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; q->backing_dev_info.state = 0; - q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY; + q->backing_dev_info.capabilities = 0; q->backing_dev_info.name = "block"; q->node = node_id; diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 4c58333..9a6b637 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -287,13 +287,24 @@ static unsigned long get_unmapped_area_mem(struct file *file, return pgoff << PAGE_SHIFT; } +/* permit direct mmap, for read, write or exec */ +static unsigned memory_mmap_capabilities(struct file *file) +{ + return NOMMU_MAP_DIRECT | + NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC; +} + +static unsigned zero_mmap_capabilities(struct file *file) +{ + return NOMMU_MAP_COPY; +} + /* can't do an in-place private mapping if there's no MMU */ static inline int private_mapping_ok(struct vm_area_struct *vma) { return vma->vm_flags & VM_MAYSHARE; } #else -#define get_unmapped_area_mem NULL static inline int private_mapping_ok(struct vm_area_struct *vma) { @@ -721,7 +732,10 @@ static const struct file_operations mem_fops = { .write = write_mem, .mmap = mmap_mem, .open = open_mem, +#ifndef CONFIG_MMU .get_unmapped_area = get_unmapped_area_mem, + .mmap_capabilities = memory_mmap_capabilities, +#endif }; #ifdef CONFIG_DEVKMEM @@ -731,7 +745,10 @@ static const struct file_operations kmem_fops = { .write = write_kmem, .mmap = mmap_kmem, .open = open_kmem, +#ifndef CONFIG_MMU .get_unmapped_area = get_unmapped_area_mem, + .mmap_capabilities = memory_mmap_capabilities, +#endif }; #endif @@ -760,16 +777,9 @@ static const struct file_operations zero_fops = { .read_iter = read_iter_zero, .aio_write = aio_write_zero, .mmap = mmap_zero, -}; - -/* - * capabilities for /dev/zero - * - permits private mappings, "copies" are taken of the source of zeros - * - no writeback happens - */ -static struct backing_dev_info zero_bdi = { - .name = "char/mem", - .capabilities = BDI_CAP_MAP_COPY | BDI_CAP_NO_ACCT_AND_WRITEBACK, +#ifndef CONFIG_MMU + .mmap_capabilities = zero_mmap_capabilities, +#endif }; static const struct file_operations full_fops = { @@ -783,22 +793,22 @@ static const struct memdev { const char *name; umode_t mode; const struct file_operations *fops; - struct backing_dev_info *dev_info; + fmode_t fmode; } devlist[] = { - [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi }, + [1] = { "mem", 0, &mem_fops, FMODE_UNSIGNED_OFFSET }, #ifdef CONFIG_DEVKMEM - [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi }, + [2] = { "kmem", 0, &kmem_fops, FMODE_UNSIGNED_OFFSET }, #endif - [3] = { "null", 0666, &null_fops, NULL }, + [3] = { "null", 0666, &null_fops, 0 }, #ifdef CONFIG_DEVPORT - [4] = { "port", 0, &port_fops, NULL }, + [4] = { "port", 0, &port_fops, 0 }, #endif - [5] = { "zero", 0666, &zero_fops, &zero_bdi }, - [7] = { "full", 0666, &full_fops, NULL }, - [8] = { "random", 0666, &random_fops, NULL }, - [9] = { "urandom", 0666, &urandom_fops, NULL }, + [5] = { "zero", 0666, &zero_fops, 0 }, + [7] = { "full", 0666, &full_fops, 0 }, + [8] = { "random", 0666, &random_fops, 0 }, + [9] = { "urandom", 0666, &urandom_fops, 0 }, #ifdef CONFIG_PRINTK - [11] = { "kmsg", 0644, &kmsg_fops, NULL }, + [11] = { "kmsg", 0644, &kmsg_fops, 0 }, #endif }; @@ -816,12 +826,7 @@ static int memory_open(struct inode *inode, struct file *filp) return -ENXIO; filp->f_op = dev->fops; - if (dev->dev_info) - filp->f_mapping->backing_dev_info = dev->dev_info; - - /* Is /dev/mem or /dev/kmem ? */ - if (dev->dev_info == &directly_mappable_cdev_bdi) - filp->f_mode |= FMODE_UNSIGNED_OFFSET; + filp->f_mode |= dev->fmode; if (dev->fops->open) return dev->fops->open(inode, filp); @@ -846,11 +851,6 @@ static struct class *mem_class; static int __init chr_dev_init(void) { int minor; - int err; - - err = bdi_init(&zero_bdi); - if (err) - return err; if (register_chrdev(MEM_MAJOR, "mem", &memory_fops)) printk("unable to get major %d for memory devs\n", MEM_MAJOR); diff --git a/drivers/char/raw.c b/drivers/char/raw.c index a24891b..6e29bf2 100644 --- a/drivers/char/raw.c +++ b/drivers/char/raw.c @@ -104,11 +104,9 @@ static int raw_release(struct inode *inode, struct file *filp) mutex_lock(&raw_mutex); bdev = raw_devices[minor].binding; - if (--raw_devices[minor].inuse == 0) { + if (--raw_devices[minor].inuse == 0) /* Here inode->i_mapping == bdev->bd_inode->i_mapping */ inode->i_mapping = &inode->i_data; - inode->i_mapping->backing_dev_info = &default_backing_dev_info; - } mutex_unlock(&raw_mutex); blkdev_put(bdev, filp->f_mode | FMODE_EXCL); diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 5356395..55fa27e 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -49,7 +49,6 @@ static DEFINE_MUTEX(mtd_mutex); */ struct mtd_file_info { struct mtd_info *mtd; - struct inode *ino; enum mtd_file_modes mode; }; @@ -59,10 +58,6 @@ static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) return fixed_size_llseek(file, offset, orig, mfi->mtd->size); } -static int count; -static struct vfsmount *mnt; -static struct file_system_type mtd_inodefs_type; - static int mtdchar_open(struct inode *inode, struct file *file) { int minor = iminor(inode); @@ -70,7 +65,6 @@ static int mtdchar_open(struct inode *inode, struct file *file) int ret = 0; struct mtd_info *mtd; struct mtd_file_info *mfi; - struct inode *mtd_ino; pr_debug("MTD_open\n"); @@ -78,10 +72,6 @@ static int mtdchar_open(struct inode *inode, struct file *file) if ((file->f_mode & FMODE_WRITE) && (minor & 1)) return -EACCES; - ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count); - if (ret) - return ret; - mutex_lock(&mtd_mutex); mtd = get_mtd_device(NULL, devnum); @@ -95,43 +85,26 @@ static int mtdchar_open(struct inode *inode, struct file *file) goto out1; } - mtd_ino = iget_locked(mnt->mnt_sb, devnum); - if (!mtd_ino) { - ret = -ENOMEM; - goto out1; - } - if (mtd_ino->i_state & I_NEW) { - mtd_ino->i_private = mtd; - mtd_ino->i_mode = S_IFCHR; - mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; - unlock_new_inode(mtd_ino); - } - file->f_mapping = mtd_ino->i_mapping; - /* You can't open it RW if it's not a writeable device */ if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { ret = -EACCES; - goto out2; + goto out1; } mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); if (!mfi) { ret = -ENOMEM; - goto out2; + goto out1; } - mfi->ino = mtd_ino; mfi->mtd = mtd; file->private_data = mfi; mutex_unlock(&mtd_mutex); return 0; -out2: - iput(mtd_ino); out1: put_mtd_device(mtd); out: mutex_unlock(&mtd_mutex); - simple_release_fs(&mnt, &count); return ret; } /* mtdchar_open */ @@ -148,12 +121,9 @@ static int mtdchar_close(struct inode *inode, struct file *file) if ((file->f_mode & FMODE_WRITE)) mtd_sync(mtd); - iput(mfi->ino); - put_mtd_device(mtd); file->private_data = NULL; kfree(mfi); - simple_release_fs(&mnt, &count); return 0; } /* mtdchar_close */ @@ -1117,6 +1087,13 @@ static unsigned long mtdchar_get_unmapped_area(struct file *file, ret = mtd_get_unmapped_area(mtd, len, offset, flags); return ret == -EOPNOTSUPP ? -ENODEV : ret; } + +static unsigned mtdchar_mmap_capabilities(struct file *file) +{ + struct mtd_file_info *mfi = file->private_data; + + return mtd_mmap_capabilities(mfi->mtd); +} #endif /* @@ -1160,27 +1137,10 @@ static const struct file_operations mtd_fops = { .mmap = mtdchar_mmap, #ifndef CONFIG_MMU .get_unmapped_area = mtdchar_get_unmapped_area, + .mmap_capabilities = mtdchar_mmap_capabilities, #endif }; -static const struct super_operations mtd_ops = { - .drop_inode = generic_delete_inode, - .statfs = simple_statfs, -}; - -static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC); -} - -static struct file_system_type mtd_inodefs_type = { - .name = "mtd_inodefs", - .mount = mtd_inodefs_mount, - .kill_sb = kill_anon_super, -}; -MODULE_ALIAS_FS("mtd_inodefs"); - int __init init_mtdchar(void) { int ret; @@ -1193,23 +1153,11 @@ int __init init_mtdchar(void) return ret; } - ret = register_filesystem(&mtd_inodefs_type); - if (ret) { - pr_err("Can't register mtd_inodefs filesystem, error %d\n", - ret); - goto err_unregister_chdev; - } - - return ret; - -err_unregister_chdev: - __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); return ret; } void __exit cleanup_mtdchar(void) { - unregister_filesystem(&mtd_inodefs_type); __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); } diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c index b900056..eacc3aa 100644 --- a/drivers/mtd/mtdconcat.c +++ b/drivers/mtd/mtdconcat.c @@ -732,8 +732,6 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks; - concat->mtd.backing_dev_info = subdev[0]->backing_dev_info; - concat->subdev[0] = subdev[0]; for (i = 1; i < num_devs; i++) { @@ -761,14 +759,6 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c subdev[i]->flags & MTD_WRITEABLE; } - /* only permit direct mapping if the BDIs are all the same - * - copy-mapping is still permitted - */ - if (concat->mtd.backing_dev_info != - subdev[i]->backing_dev_info) - concat->mtd.backing_dev_info = - &default_backing_dev_info; - concat->mtd.size += subdev[i]->size; concat->mtd.ecc_stats.badblocks += subdev[i]->ecc_stats.badblocks; diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 4c61187..0ec4d6e 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -43,33 +43,7 @@ #include "mtdcore.h" -/* - * backing device capabilities for non-mappable devices (such as NAND flash) - * - permits private mappings, copies are taken of the data - */ -static struct backing_dev_info mtd_bdi_unmappable = { - .capabilities = BDI_CAP_MAP_COPY, -}; - -/* - * backing device capabilities for R/O mappable devices (such as ROM) - * - permits private mappings, copies are taken of the data - * - permits non-writable shared mappings - */ -static struct backing_dev_info mtd_bdi_ro_mappable = { - .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | - BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), -}; - -/* - * backing device capabilities for writable mappable devices (such as RAM) - * - permits private mappings, copies are taken of the data - * - permits non-writable shared mappings - */ -static struct backing_dev_info mtd_bdi_rw_mappable = { - .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | - BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | - BDI_CAP_WRITE_MAP), +static struct backing_dev_info mtd_bdi = { }; static int mtd_cls_suspend(struct device *dev, pm_message_t state); @@ -365,6 +339,23 @@ static struct device_type mtd_devtype = { .release = mtd_release, }; +#ifndef CONFIG_MMU +unsigned mtd_mmap_capabilities(struct mtd_info *mtd) +{ + switch (mtd->type) { + case MTD_RAM: + return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | + NOMMU_MAP_READ | NOMMU_MAP_WRITE; + case MTD_ROM: + return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC | + NOMMU_MAP_READ; + default: + return NOMMU_MAP_COPY; + } +} +EXPORT_SYMBOL_GPL(mtd_mmap_capabilities); +#endif + /** * add_mtd_device - register an MTD device * @mtd: pointer to new MTD device info structure @@ -380,19 +371,7 @@ int add_mtd_device(struct mtd_info *mtd) struct mtd_notifier *not; int i, error; - if (!mtd->backing_dev_info) { - switch (mtd->type) { - case MTD_RAM: - mtd->backing_dev_info = &mtd_bdi_rw_mappable; - break; - case MTD_ROM: - mtd->backing_dev_info = &mtd_bdi_ro_mappable; - break; - default: - mtd->backing_dev_info = &mtd_bdi_unmappable; - break; - } - } + mtd->backing_dev_info = &mtd_bdi; BUG_ON(mtd->writesize == 0); mutex_lock(&mtd_table_mutex); @@ -1237,17 +1216,9 @@ static int __init init_mtd(void) if (ret) goto err_reg; - ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); - if (ret) - goto err_bdi1; - - ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); - if (ret) - goto err_bdi2; - - ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); + ret = mtd_bdi_init(&mtd_bdi, "mtd"); if (ret) - goto err_bdi3; + goto err_bdi; proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); @@ -1260,11 +1231,7 @@ static int __init init_mtd(void) out_procfs: if (proc_mtd) remove_proc_entry("mtd", NULL); -err_bdi3: - bdi_destroy(&mtd_bdi_ro_mappable); -err_bdi2: - bdi_destroy(&mtd_bdi_unmappable); -err_bdi1: +err_bdi: class_unregister(&mtd_class); err_reg: pr_err("Error registering mtd class or bdi: %d\n", ret); @@ -1277,9 +1244,7 @@ static void __exit cleanup_mtd(void) if (proc_mtd) remove_proc_entry("mtd", NULL); class_unregister(&mtd_class); - bdi_destroy(&mtd_bdi_unmappable); - bdi_destroy(&mtd_bdi_ro_mappable); - bdi_destroy(&mtd_bdi_rw_mappable); + bdi_destroy(&mtd_bdi); } module_init(init_mtd); diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index a3e3a7d..e779de3 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -378,7 +378,6 @@ static struct mtd_part *allocate_partition(struct mtd_info *master, slave->mtd.name = name; slave->mtd.owner = master->owner; - slave->mtd.backing_dev_info = master->backing_dev_info; /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone * to have the same data be in two different partitions. diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c index a3367bf..45aaa1c 100644 --- a/drivers/staging/lustre/lustre/llite/llite_lib.c +++ b/drivers/staging/lustre/lustre/llite/llite_lib.c @@ -987,7 +987,7 @@ int ll_fill_super(struct super_block *sb, struct vfsmount *mnt) if (err) goto out_free; lsi->lsi_flags |= LSI_BDI_INITIALIZED; - lsi->lsi_bdi.capabilities = BDI_CAP_MAP_COPY; + lsi->lsi_bdi.capabilities = 0; err = ll_bdi_register(&lsi->lsi_bdi); if (err) goto out_free; @@ -1812,10 +1812,6 @@ void ll_read_inode2(struct inode *inode, void *opaque) /* OIDEBUG(inode); */ - /* initializing backing dev info. */ - inode->i_mapping->backing_dev_info = &s2lsi(inode->i_sb)->lsi_bdi; - - if (S_ISREG(inode->i_mode)) { struct ll_sb_info *sbi = ll_i2sbi(inode); diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c index 6894b08..620d934 100644 --- a/fs/9p/v9fs.c +++ b/fs/9p/v9fs.c @@ -335,7 +335,7 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, } init_rwsem(&v9ses->rename_sem); - rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); + rc = bdi_setup_and_register(&v9ses->bdi, "9p"); if (rc) { kfree(v9ses->aname); kfree(v9ses->uname); diff --git a/fs/afs/volume.c b/fs/afs/volume.c index 2b60725..d142a24 100644 --- a/fs/afs/volume.c +++ b/fs/afs/volume.c @@ -106,7 +106,7 @@ struct afs_volume *afs_volume_lookup(struct afs_mount_params *params) volume->cell = params->cell; volume->vid = vlocation->vldb.vid[params->type]; - ret = bdi_setup_and_register(&volume->bdi, "afs", BDI_CAP_MAP_COPY); + ret = bdi_setup_and_register(&volume->bdi, "afs"); if (ret) goto error_bdi; @@ -165,15 +165,6 @@ static struct vfsmount *aio_mnt; static const struct file_operations aio_ring_fops; static const struct address_space_operations aio_ctx_aops; -/* Backing dev info for aio fs. - * -no dirty page accounting or writeback happens - */ -static struct backing_dev_info aio_fs_backing_dev_info = { - .name = "aiofs", - .state = 0, - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_MAP_COPY, -}; - static struct file *aio_private_file(struct kioctx *ctx, loff_t nr_pages) { struct qstr this = QSTR_INIT("[aio]", 5); @@ -185,7 +176,6 @@ static struct file *aio_private_file(struct kioctx *ctx, loff_t nr_pages) inode->i_mapping->a_ops = &aio_ctx_aops; inode->i_mapping->private_data = ctx; - inode->i_mapping->backing_dev_info = &aio_fs_backing_dev_info; inode->i_size = PAGE_SIZE * nr_pages; path.dentry = d_alloc_pseudo(aio_mnt->mnt_sb, &this); @@ -230,9 +220,6 @@ static int __init aio_setup(void) if (IS_ERR(aio_mnt)) panic("Failed to create aio fs mount."); - if (bdi_init(&aio_fs_backing_dev_info)) - panic("Failed to init aio fs backing dev info."); - kiocb_cachep = KMEM_CACHE(kiocb, SLAB_HWCACHE_ALIGN|SLAB_PANIC); kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC); diff --git a/fs/block_dev.c b/fs/block_dev.c index b48c41b..a9f9279 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -49,23 +49,15 @@ inline struct block_device *I_BDEV(struct inode *inode) } EXPORT_SYMBOL(I_BDEV); -/* - * Move the inode from its current bdi to a new bdi. Make sure the inode - * is clean before moving so that it doesn't linger on the old bdi. - */ -static void bdev_inode_switch_bdi(struct inode *inode, - struct backing_dev_info *dst) +static void bdev_write_inode(struct inode *inode) { - while (true) { - spin_lock(&inode->i_lock); - if (!(inode->i_state & I_DIRTY)) { - inode->i_data.backing_dev_info = dst; - spin_unlock(&inode->i_lock); - return; - } + spin_lock(&inode->i_lock); + while (inode->i_state & I_DIRTY) { spin_unlock(&inode->i_lock); WARN_ON_ONCE(write_inode_now(inode, true)); + spin_lock(&inode->i_lock); } + spin_unlock(&inode->i_lock); } /* Kill _all_ buffers and pagecache , dirty or not.. */ @@ -584,7 +576,6 @@ struct block_device *bdget(dev_t dev) inode->i_bdev = bdev; inode->i_data.a_ops = &def_blk_aops; mapping_set_gfp_mask(&inode->i_data, GFP_USER); - inode->i_data.backing_dev_info = &default_backing_dev_info; spin_lock(&bdev_lock); list_add(&bdev->bd_list, &all_bdevs); spin_unlock(&bdev_lock); @@ -1145,8 +1136,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_queue = disk->queue; bdev->bd_contains = bdev; if (!partno) { - struct backing_dev_info *bdi; - ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) @@ -1172,11 +1161,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) } } - if (!ret) { + if (!ret) bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); - bdi = blk_get_backing_dev_info(bdev); - bdev_inode_switch_bdi(bdev->bd_inode, bdi); - } /* * If the device is invalidated, rescan partition @@ -1203,8 +1189,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) if (ret) goto out_clear; bdev->bd_contains = whole; - bdev_inode_switch_bdi(bdev->bd_inode, - whole->bd_inode->i_data.backing_dev_info); bdev->bd_part = disk_get_part(disk, partno); if (!(disk->flags & GENHD_FL_UP) || !bdev->bd_part || !bdev->bd_part->nr_sects) { @@ -1244,7 +1228,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_disk = NULL; bdev->bd_part = NULL; bdev->bd_queue = NULL; - bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info); if (bdev != bdev->bd_contains) __blkdev_put(bdev->bd_contains, mode, 1); bdev->bd_contains = NULL; @@ -1464,11 +1447,11 @@ static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) WARN_ON_ONCE(bdev->bd_holders); sync_blockdev(bdev); kill_bdev(bdev); - /* ->release can cause the old bdi to disappear, - * so must switch it out first + /* + * ->release can cause the queue to disappear, so flush all + * dirty data before. */ - bdev_inode_switch_bdi(bdev->bd_inode, - &default_backing_dev_info); + bdev_write_inode(bdev->bd_inode); } if (bdev->bd_contains == bdev) { if (disk->fops->release) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 8c63419..1afb182 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1715,12 +1715,11 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) { int err; - bdi->capabilities = BDI_CAP_MAP_COPY; - err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); + err = bdi_setup_and_register(bdi, "btrfs"); if (err) return err; - bdi->ra_pages = default_backing_dev_info.ra_pages; + bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; bdi->congested_fn = btrfs_congested_fn; bdi->congested_data = info; return 0; @@ -2319,7 +2318,6 @@ int open_ctree(struct super_block *sb, */ fs_info->btree_inode->i_size = OFFSET_MAX; fs_info->btree_inode->i_mapping->a_ops = &btree_aops; - fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index a606ab5..b78bbba 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1746,7 +1746,7 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb, mutex_lock(&inode->i_mutex); - current->backing_dev_info = inode->i_mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) { mutex_unlock(&inode->i_mutex); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 8bf326a..54bcf63 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -3608,7 +3608,6 @@ cache_acl: switch (inode->i_mode & S_IFMT) { case S_IFREG: inode->i_mapping->a_ops = &btrfs_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; inode->i_fop = &btrfs_file_operations; inode->i_op = &btrfs_file_inode_operations; @@ -3623,7 +3622,6 @@ cache_acl: case S_IFLNK: inode->i_op = &btrfs_symlink_inode_operations; inode->i_mapping->a_ops = &btrfs_symlink_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; break; default: inode->i_op = &btrfs_special_inode_operations; @@ -6088,7 +6086,6 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry, inode->i_fop = &btrfs_file_operations; inode->i_op = &btrfs_file_inode_operations; inode->i_mapping->a_ops = &btrfs_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); if (err) @@ -9203,7 +9200,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, inode->i_fop = &btrfs_file_operations; inode->i_op = &btrfs_file_inode_operations; inode->i_mapping->a_ops = &btrfs_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); @@ -9247,7 +9243,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, inode->i_op = &btrfs_symlink_inode_operations; inode->i_mapping->a_ops = &btrfs_symlink_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; inode_set_bytes(inode, name_len); btrfs_i_size_write(inode, name_len); err = btrfs_update_inode(trans, root, inode); @@ -9459,7 +9454,6 @@ static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) inode->i_op = &btrfs_file_inode_operations; inode->i_mapping->a_ops = &btrfs_aops; - inode->i_mapping->backing_dev_info = &root->fs_info->bdi; BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; ret = btrfs_init_inode_security(trans, inode, dir, NULL); diff --git a/fs/ceph/file.c b/fs/ceph/file.c index ce74b39..905986d 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -945,7 +945,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from) mutex_lock(&inode->i_mutex); /* We can write back this queue in page reclaim */ - current->backing_dev_info = file->f_mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index f61a741..6b51736 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -783,8 +783,6 @@ static int fill_inode(struct inode *inode, struct page *locked_page, } inode->i_mapping->a_ops = &ceph_aops; - inode->i_mapping->backing_dev_info = - &ceph_sb_to_client(inode->i_sb)->backing_dev_info; switch (inode->i_mode & S_IFMT) { case S_IFIFO: diff --git a/fs/ceph/super.c b/fs/ceph/super.c index 50f06cd..5ae6258 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -40,17 +40,6 @@ static void ceph_put_super(struct super_block *s) dout("put_super\n"); ceph_mdsc_close_sessions(fsc->mdsc); - - /* - * ensure we release the bdi before put_anon_super releases - * the device name. - */ - if (s->s_bdi == &fsc->backing_dev_info) { - bdi_unregister(&fsc->backing_dev_info); - s->s_bdi = NULL; - } - - return; } static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) @@ -910,7 +899,7 @@ static int ceph_register_bdi(struct super_block *sb, >> PAGE_SHIFT; else fsc->backing_dev_info.ra_pages = - default_backing_dev_info.ra_pages; + VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", atomic_long_inc_return(&bdi_seq)); @@ -1002,11 +991,16 @@ out_final: static void ceph_kill_sb(struct super_block *s) { struct ceph_fs_client *fsc = ceph_sb_to_client(s); + dev_t dev = s->s_dev; + dout("kill_sb %p\n", s); + ceph_mdsc_pre_umount(fsc->mdsc); - kill_anon_super(s); /* will call put_super after sb is r/o */ + generic_shutdown_super(s); ceph_mdsc_destroy(fsc); + destroy_fs_client(fsc); + free_anon_bdev(dev); } static struct file_system_type ceph_fs_type = { diff --git a/fs/char_dev.c b/fs/char_dev.c index 67b2007..ea06a3d 100644 --- a/fs/char_dev.c +++ b/fs/char_dev.c @@ -24,27 +24,6 @@ #include "internal.h" -/* - * capabilities for /dev/mem, /dev/kmem and similar directly mappable character - * devices - * - permits shared-mmap for read, write and/or exec - * - does not permit private mmap in NOMMU mode (can't do COW) - * - no readahead or I/O queue unplugging required - */ -struct backing_dev_info directly_mappable_cdev_bdi = { - .name = "char", - .capabilities = ( -#ifdef CONFIG_MMU - /* permit private copies of the data to be taken */ - BDI_CAP_MAP_COPY | -#endif - /* permit direct mmap, for read, write or exec */ - BDI_CAP_MAP_DIRECT | - BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP | - /* no writeback happens */ - BDI_CAP_NO_ACCT_AND_WRITEBACK), -}; - static struct kobj_map *cdev_map; static DEFINE_MUTEX(chrdevs_lock); @@ -575,8 +554,6 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data) void __init chrdev_init(void) { cdev_map = kobj_map_init(base_probe, &chrdevs_lock); - if (bdi_init(&directly_mappable_cdev_bdi)) - panic("Failed to init directly mappable cdev bdi"); } @@ -590,4 +567,3 @@ EXPORT_SYMBOL(cdev_del); EXPORT_SYMBOL(cdev_add); EXPORT_SYMBOL(__register_chrdev); EXPORT_SYMBOL(__unregister_chrdev); -EXPORT_SYMBOL(directly_mappable_cdev_bdi); diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 2a772da..d3aa999 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3446,7 +3446,7 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) int referral_walks_count = 0; #endif - rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY); + rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs"); if (rc) return rc; diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 0c3ce464..2d4f372 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -937,8 +937,6 @@ retry_iget5_locked: inode->i_flags |= S_NOATIME | S_NOCMTIME; if (inode->i_state & I_NEW) { inode->i_ino = hash; - if (S_ISREG(inode->i_mode)) - inode->i_data.backing_dev_info = sb->s_bdi; #ifdef CONFIG_CIFS_FSCACHE /* initialize per-inode cache cookie pointer */ CIFS_I(inode)->fscache = NULL; diff --git a/fs/coda/inode.c b/fs/coda/inode.c index b945410..82ec68b 100644 --- a/fs/coda/inode.c +++ b/fs/coda/inode.c @@ -183,7 +183,7 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent) goto unlock_out; } - error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); + error = bdi_setup_and_register(&vc->bdi, "coda"); if (error) goto unlock_out; diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h index bd4a3c1..a315677 100644 --- a/fs/configfs/configfs_internal.h +++ b/fs/configfs/configfs_internal.h @@ -70,8 +70,6 @@ extern int configfs_is_root(struct config_item *item); extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *); extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *)); -extern int configfs_inode_init(void); -extern void configfs_inode_exit(void); extern int configfs_create_file(struct config_item *, const struct configfs_attribute *); extern int configfs_make_dirent(struct configfs_dirent *, diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c index 5946ad9..65af861 100644 --- a/fs/configfs/inode.c +++ b/fs/configfs/inode.c @@ -50,12 +50,6 @@ static const struct address_space_operations configfs_aops = { .write_end = simple_write_end, }; -static struct backing_dev_info configfs_backing_dev_info = { - .name = "configfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - static const struct inode_operations configfs_inode_operations ={ .setattr = configfs_setattr, }; @@ -137,7 +131,6 @@ struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent *sd, if (inode) { inode->i_ino = get_next_ino(); inode->i_mapping->a_ops = &configfs_aops; - inode->i_mapping->backing_dev_info = &configfs_backing_dev_info; inode->i_op = &configfs_inode_operations; if (sd->s_iattr) { @@ -283,13 +276,3 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name) } mutex_unlock(&dir->d_inode->i_mutex); } - -int __init configfs_inode_init(void) -{ - return bdi_init(&configfs_backing_dev_info); -} - -void configfs_inode_exit(void) -{ - bdi_destroy(&configfs_backing_dev_info); -} diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c index f6c2858..da94e41 100644 --- a/fs/configfs/mount.c +++ b/fs/configfs/mount.c @@ -145,19 +145,13 @@ static int __init configfs_init(void) if (!config_kobj) goto out2; - err = configfs_inode_init(); - if (err) - goto out3; - err = register_filesystem(&configfs_fs_type); if (err) - goto out4; + goto out3; return 0; -out4: - pr_err("Unable to register filesystem!\n"); - configfs_inode_exit(); out3: + pr_err("Unable to register filesystem!\n"); kobject_put(config_kobj); out2: kmem_cache_destroy(configfs_dir_cachep); @@ -172,7 +166,6 @@ static void __exit configfs_exit(void) kobject_put(config_kobj); kmem_cache_destroy(configfs_dir_cachep); configfs_dir_cachep = NULL; - configfs_inode_exit(); } MODULE_AUTHOR("Oracle"); diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 1686dc2..34b36a5 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -67,7 +67,6 @@ static int ecryptfs_inode_set(struct inode *inode, void *opaque) inode->i_ino = lower_inode->i_ino; inode->i_version++; inode->i_mapping->a_ops = &ecryptfs_aops; - inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; if (S_ISLNK(inode->i_mode)) inode->i_op = &ecryptfs_symlink_iops; diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index d9eb84b..1895d60 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -520,7 +520,7 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags goto out; } - rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY); + rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs"); if (rc) goto out1; diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c index f1d3d4e..6fc91df 100644 --- a/fs/exofs/inode.c +++ b/fs/exofs/inode.c @@ -1214,7 +1214,6 @@ struct inode *exofs_iget(struct super_block *sb, unsigned long ino) memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data)); } - inode->i_mapping->backing_dev_info = sb->s_bdi; if (S_ISREG(inode->i_mode)) { inode->i_op = &exofs_file_inode_operations; inode->i_fop = &exofs_file_operations; @@ -1314,7 +1313,6 @@ struct inode *exofs_new_inode(struct inode *dir, umode_t mode) set_obj_2bcreated(oi); - inode->i_mapping->backing_dev_info = sb->s_bdi; inode_init_owner(inode, dir, mode); inode->i_ino = sbi->s_nextid++; inode->i_blkbits = EXOFS_BLKSHIFT; diff --git a/fs/exofs/super.c b/fs/exofs/super.c index 9596550..fcc2e56 100644 --- a/fs/exofs/super.c +++ b/fs/exofs/super.c @@ -836,7 +836,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent) goto free_sbi; } - ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); + ret = bdi_setup_and_register(&sbi->bdi, "exofs"); if (ret) { EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); dput(sb->s_root); diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c index 7d66fb0..6c14bb8 100644 --- a/fs/ext2/ialloc.c +++ b/fs/ext2/ialloc.c @@ -170,7 +170,7 @@ static void ext2_preread_inode(struct inode *inode) struct ext2_group_desc * gdp; struct backing_dev_info *bdi; - bdi = inode->i_mapping->backing_dev_info; + bdi = inode_to_bdi(inode); if (bdi_read_congested(bdi)) return; if (bdi_write_congested(bdi)) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index ac64edb..64c39c7 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -334,7 +334,7 @@ static void save_error_info(struct super_block *sb, const char *func, static int block_device_ejected(struct super_block *sb) { struct inode *bd_inode = sb->s_bdev->bd_inode; - struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(bd_inode); return bdi->dev == NULL; } diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 2d609a5..c399152 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -66,15 +66,21 @@ int writeback_in_progress(struct backing_dev_info *bdi) } EXPORT_SYMBOL(writeback_in_progress); -static inline struct backing_dev_info *inode_to_bdi(struct inode *inode) +struct backing_dev_info *inode_to_bdi(struct inode *inode) { - struct super_block *sb = inode->i_sb; + struct super_block *sb; - if (sb_is_blkdev_sb(sb)) - return inode->i_mapping->backing_dev_info; + if (!inode) + return &noop_backing_dev_info; + sb = inode->i_sb; +#ifdef CONFIG_BLOCK + if (sb_is_blkdev_sb(sb)) + return blk_get_backing_dev_info(I_BDEV(inode)); +#endif return sb->s_bdi; } +EXPORT_SYMBOL_GPL(inode_to_bdi); static inline struct inode *wb_inode(struct list_head *head) { diff --git a/fs/fuse/file.c b/fs/fuse/file.c index d769e59..c01ec3b 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1159,7 +1159,7 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) mutex_lock(&inode->i_mutex); /* We can write back this queue in page reclaim */ - current->backing_dev_info = mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) @@ -1464,7 +1464,7 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req) { struct inode *inode = req->inode; struct fuse_inode *fi = get_fuse_inode(inode); - struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(inode); int i; list_del(&req->writepages_entry); @@ -1658,7 +1658,7 @@ static int fuse_writepage_locked(struct page *page) req->end = fuse_writepage_end; req->inode = inode; - inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK); + inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK); inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); spin_lock(&fc->lock); @@ -1768,7 +1768,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req, if (old_req->num_pages == 1 && (old_req->state == FUSE_REQ_INIT || old_req->state == FUSE_REQ_PENDING)) { - struct backing_dev_info *bdi = page->mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(page->mapping->host); copy_highpage(old_req->pages[0], page); spin_unlock(&fc->lock); @@ -1872,7 +1872,7 @@ static int fuse_writepages_fill(struct page *page, req->page_descs[req->num_pages].offset = 0; req->page_descs[req->num_pages].length = PAGE_SIZE; - inc_bdi_stat(page->mapping->backing_dev_info, BDI_WRITEBACK); + inc_bdi_stat(inode_to_bdi(inode), BDI_WRITEBACK); inc_zone_page_state(tmp_page, NR_WRITEBACK_TEMP); err = 0; diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index f38256e..e8799c1 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -308,7 +308,6 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid, if (!fc->writeback_cache || !S_ISREG(attr->mode)) inode->i_flags |= S_NOCMTIME; inode->i_generation = generation; - inode->i_data.backing_dev_info = &fc->bdi; fuse_init_inode(inode, attr); unlock_new_inode(inode); } else if ((inode->i_mode ^ attr->mode) & S_IFMT) { diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index 805b37f..4ad4f94 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -289,7 +289,7 @@ continue_unlock: if (!clear_page_dirty_for_io(page)) goto continue_unlock; - trace_wbc_writepage(wbc, mapping->backing_dev_info); + trace_wbc_writepage(wbc, inode_to_bdi(inode)); ret = __gfs2_jdata_writepage(page, wbc); if (unlikely(ret)) { diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index aeb7bc9..f42dffb 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -768,7 +768,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, mapping->flags = 0; mapping_set_gfp_mask(mapping, GFP_NOFS); mapping->private_data = NULL; - mapping->backing_dev_info = s->s_bdi; mapping->writeback_index = 0; } diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 8633ad3..efc8e25 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -112,7 +112,6 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb) mapping->flags = 0; mapping_set_gfp_mask(mapping, GFP_NOFS); mapping->private_data = NULL; - mapping->backing_dev_info = sb->s_bdi; mapping->writeback_index = 0; spin_lock_init(&sdp->sd_log_lock); diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 5b327f8..1666382 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -743,7 +743,7 @@ static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); - struct backing_dev_info *bdi = metamapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); int ret = 0; if (wbc->sync_mode == WB_SYNC_ALL) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 5eba47f..c274aca 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -62,12 +62,6 @@ static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode) return container_of(inode, struct hugetlbfs_inode_info, vfs_inode); } -static struct backing_dev_info hugetlbfs_backing_dev_info = { - .name = "hugetlbfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - int sysctl_hugetlb_shm_group; enum { @@ -498,7 +492,6 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, lockdep_set_class(&inode->i_mapping->i_mmap_rwsem, &hugetlbfs_i_mmap_rwsem_key); inode->i_mapping->a_ops = &hugetlbfs_aops; - inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_mapping->private_data = resv_map; info = HUGETLBFS_I(inode); @@ -1032,10 +1025,6 @@ static int __init init_hugetlbfs_fs(void) return -ENOTSUPP; } - error = bdi_init(&hugetlbfs_backing_dev_info); - if (error) - return error; - error = -ENOMEM; hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache", sizeof(struct hugetlbfs_inode_info), @@ -1071,7 +1060,6 @@ static int __init init_hugetlbfs_fs(void) out: kmem_cache_destroy(hugetlbfs_inode_cachep); out2: - bdi_destroy(&hugetlbfs_backing_dev_info); return error; } @@ -1091,7 +1079,6 @@ static void __exit exit_hugetlbfs_fs(void) for_each_hstate(h) kern_unmount(hugetlbfs_vfsmount[i++]); unregister_filesystem(&hugetlbfs_fs_type); - bdi_destroy(&hugetlbfs_backing_dev_info); } module_init(init_hugetlbfs_fs) @@ -170,20 +170,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode) atomic_set(&mapping->i_mmap_writable, 0); mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); mapping->private_data = NULL; - mapping->backing_dev_info = &default_backing_dev_info; mapping->writeback_index = 0; - - /* - * If the block_device provides a backing_dev_info for client - * inodes then use that. Otherwise the inode share the bdev's - * backing_dev_info. - */ - if (sb->s_bdev) { - struct backing_dev_info *bdi; - - bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; - mapping->backing_dev_info = bdi; - } inode->i_private = NULL; inode->i_mapping = mapping; INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */ diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c index 9852176..9000874 100644 --- a/fs/kernfs/inode.c +++ b/fs/kernfs/inode.c @@ -24,12 +24,6 @@ static const struct address_space_operations kernfs_aops = { .write_end = simple_write_end, }; -static struct backing_dev_info kernfs_bdi = { - .name = "kernfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - static const struct inode_operations kernfs_iops = { .permission = kernfs_iop_permission, .setattr = kernfs_iop_setattr, @@ -40,12 +34,6 @@ static const struct inode_operations kernfs_iops = { .listxattr = kernfs_iop_listxattr, }; -void __init kernfs_inode_init(void) -{ - if (bdi_init(&kernfs_bdi)) - panic("failed to init kernfs_bdi"); -} - static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) { static DEFINE_MUTEX(iattr_mutex); @@ -298,7 +286,6 @@ static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode) kernfs_get(kn); inode->i_private = kn; inode->i_mapping->a_ops = &kernfs_aops; - inode->i_mapping->backing_dev_info = &kernfs_bdi; inode->i_op = &kernfs_iops; set_default_inode_attr(inode, kn->mode); diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h index dc84a3e..af9fa74 100644 --- a/fs/kernfs/kernfs-internal.h +++ b/fs/kernfs/kernfs-internal.h @@ -88,7 +88,6 @@ int kernfs_iop_removexattr(struct dentry *dentry, const char *name); ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf, size_t size); ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size); -void kernfs_inode_init(void); /* * dir.c diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index f973ae9..8eaf417 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -246,5 +246,4 @@ void __init kernfs_init(void) kernfs_node_cache = kmem_cache_create("kernfs_node_cache", sizeof(struct kernfs_node), 0, SLAB_PANIC, NULL); - kernfs_inode_init(); } diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c index e31e589..01a9e16 100644 --- a/fs/ncpfs/inode.c +++ b/fs/ncpfs/inode.c @@ -267,7 +267,6 @@ ncp_iget(struct super_block *sb, struct ncp_entry_info *info) if (inode) { atomic_set(&NCP_FINFO(inode)->opened, info->opened); - inode->i_mapping->backing_dev_info = sb->s_bdi; inode->i_ino = info->ino; ncp_set_attr(inode, info); if (S_ISREG(inode->i_mode)) { @@ -560,7 +559,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent) server = NCP_SBP(sb); memset(server, 0, sizeof(*server)); - error = bdi_setup_and_register(&server->bdi, "ncpfs", BDI_CAP_MAP_COPY); + error = bdi_setup_and_register(&server->bdi, "ncpfs"); if (error) goto out_fput; diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c index 3c97694..7ae1c26 100644 --- a/fs/nfs/filelayout/filelayout.c +++ b/fs/nfs/filelayout/filelayout.c @@ -1002,7 +1002,7 @@ mds_commit: spin_unlock(cinfo->lock); if (!cinfo->dreq) { inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); - inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, + inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host), BDI_RECLAIMABLE); __mark_inode_dirty(req->wb_context->dentry->d_inode, I_DIRTY_DATASYNC); diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index f29fb7d..c22ecaa 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -1366,7 +1366,7 @@ ff_layout_mark_request_commit(struct nfs_page *req, spin_unlock(cinfo->lock); if (!cinfo->dreq) { inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); - inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, + inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host), BDI_RECLAIMABLE); __mark_inode_dirty(req->wb_context->dentry->d_inode, I_DIRTY_DATASYNC); diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index d2398c1..e4f0dce 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -388,7 +388,6 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, st if (S_ISREG(inode->i_mode)) { inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; inode->i_data.a_ops = &nfs_file_aops; - inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; inode->i_fop = &nfs_dir_operations; diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 21469e6..212b8c8 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -430,7 +430,6 @@ int nfs_show_options(struct seq_file *, struct dentry *); int nfs_show_devname(struct seq_file *, struct dentry *); int nfs_show_path(struct seq_file *, struct dentry *); int nfs_show_stats(struct seq_file *, struct dentry *); -void nfs_put_super(struct super_block *); int nfs_remount(struct super_block *sb, int *flags, char *raw_data); /* write.c */ diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c index 48cea3c..75090fe 100644 --- a/fs/nfs/nfs4super.c +++ b/fs/nfs/nfs4super.c @@ -53,7 +53,6 @@ static const struct super_operations nfs4_sops = { .destroy_inode = nfs_destroy_inode, .write_inode = nfs4_write_inode, .drop_inode = nfs_drop_inode, - .put_super = nfs_put_super, .statfs = nfs_statfs, .evict_inode = nfs4_evict_inode, .umount_begin = nfs_umount_begin, diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 368d939..322b2de02 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -311,7 +311,6 @@ const struct super_operations nfs_sops = { .destroy_inode = nfs_destroy_inode, .write_inode = nfs_write_inode, .drop_inode = nfs_drop_inode, - .put_super = nfs_put_super, .statfs = nfs_statfs, .evict_inode = nfs_evict_inode, .umount_begin = nfs_umount_begin, @@ -2572,7 +2571,7 @@ struct dentry *nfs_fs_mount_common(struct nfs_server *server, error = nfs_bdi_register(server); if (error) { mntroot = ERR_PTR(error); - goto error_splat_bdi; + goto error_splat_super; } server->super = s; } @@ -2604,9 +2603,6 @@ error_splat_root: dput(mntroot); mntroot = ERR_PTR(error); error_splat_super: - if (server && !s->s_root) - bdi_unregister(&server->backing_dev_info); -error_splat_bdi: deactivate_locked_super(s); goto out; } @@ -2654,27 +2650,19 @@ out: EXPORT_SYMBOL_GPL(nfs_fs_mount); /* - * Ensure that we unregister the bdi before kill_anon_super - * releases the device name - */ -void nfs_put_super(struct super_block *s) -{ - struct nfs_server *server = NFS_SB(s); - - bdi_unregister(&server->backing_dev_info); -} -EXPORT_SYMBOL_GPL(nfs_put_super); - -/* * Destroy an NFS2/3 superblock */ void nfs_kill_super(struct super_block *s) { struct nfs_server *server = NFS_SB(s); + dev_t dev = s->s_dev; + + generic_shutdown_super(s); - kill_anon_super(s); nfs_fscache_release_super_cookie(s); + nfs_free_server(server); + free_anon_bdev(dev); } EXPORT_SYMBOL_GPL(nfs_kill_super); diff --git a/fs/nfs/write.c b/fs/nfs/write.c index bcf83e5..88a6d21 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -791,7 +791,7 @@ nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, spin_unlock(cinfo->lock); if (!cinfo->dreq) { inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); - inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, + inc_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host), BDI_RECLAIMABLE); __mark_inode_dirty(req->wb_context->dentry->d_inode, I_DIRTY_DATASYNC); @@ -858,7 +858,7 @@ static void nfs_clear_page_commit(struct page *page) { dec_zone_page_state(page, NR_UNSTABLE_NFS); - dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); + dec_bdi_stat(inode_to_bdi(page_file_mapping(page)->host), BDI_RECLAIMABLE); } /* Called holding inode (/cinfo) lock */ @@ -1607,7 +1607,7 @@ void nfs_retry_commit(struct list_head *page_list, nfs_mark_request_commit(req, lseg, cinfo, ds_commit_idx); if (!cinfo->dreq) { dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); - dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, + dec_bdi_stat(inode_to_bdi(page_file_mapping(req->wb_page)->host), BDI_RECLAIMABLE); } nfs_unlock_and_release_request(req); diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c index 57ceaf3..748ca23 100644 --- a/fs/nilfs2/gcinode.c +++ b/fs/nilfs2/gcinode.c @@ -172,7 +172,6 @@ int nilfs_init_gcinode(struct inode *inode) inode->i_mode = S_IFREG; mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); inode->i_mapping->a_ops = &empty_aops; - inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; ii->i_flags = 0; nilfs_bmap_init_gc(ii->i_bmap); diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c index c4dcd1d..892cf5f 100644 --- a/fs/nilfs2/mdt.c +++ b/fs/nilfs2/mdt.c @@ -429,7 +429,6 @@ int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) inode->i_mode = S_IFREG; mapping_set_gfp_mask(inode->i_mapping, gfp_mask); - inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; inode->i_op = &def_mdt_iops; inode->i_fop = &def_mdt_fops; @@ -457,13 +456,12 @@ int nilfs_mdt_setup_shadow_map(struct inode *inode, struct nilfs_shadow_map *shadow) { struct nilfs_mdt_info *mi = NILFS_MDT(inode); - struct backing_dev_info *bdi = inode->i_sb->s_bdi; INIT_LIST_HEAD(&shadow->frozen_buffers); address_space_init_once(&shadow->frozen_data); - nilfs_mapping_init(&shadow->frozen_data, inode, bdi); + nilfs_mapping_init(&shadow->frozen_data, inode); address_space_init_once(&shadow->frozen_btnodes); - nilfs_mapping_init(&shadow->frozen_btnodes, inode, bdi); + nilfs_mapping_init(&shadow->frozen_btnodes, inode); mi->mi_shadow = shadow; return 0; } diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c index da27664..700ecbc 100644 --- a/fs/nilfs2/page.c +++ b/fs/nilfs2/page.c @@ -461,14 +461,12 @@ unsigned nilfs_page_count_clean_buffers(struct page *page, return nc; } -void nilfs_mapping_init(struct address_space *mapping, struct inode *inode, - struct backing_dev_info *bdi) +void nilfs_mapping_init(struct address_space *mapping, struct inode *inode) { mapping->host = inode; mapping->flags = 0; mapping_set_gfp_mask(mapping, GFP_NOFS); mapping->private_data = NULL; - mapping->backing_dev_info = bdi; mapping->a_ops = &empty_aops; } diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h index ef30c5c..a43b8287 100644 --- a/fs/nilfs2/page.h +++ b/fs/nilfs2/page.h @@ -57,8 +57,7 @@ int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); void nilfs_copy_back_pages(struct address_space *, struct address_space *); void nilfs_clear_dirty_page(struct page *, bool); void nilfs_clear_dirty_pages(struct address_space *, bool); -void nilfs_mapping_init(struct address_space *mapping, struct inode *inode, - struct backing_dev_info *bdi); +void nilfs_mapping_init(struct address_space *mapping, struct inode *inode); unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); unsigned long nilfs_find_uncommitted_extent(struct inode *inode, sector_t start_blk, diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 2e5b3ec..5bc2a1c 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -166,7 +166,7 @@ struct inode *nilfs_alloc_inode(struct super_block *sb) ii->i_state = 0; ii->i_cno = 0; ii->vfs_inode.i_version = 1; - nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode, sb->s_bdi); + nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode); return &ii->vfs_inode; } @@ -1057,7 +1057,6 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent) { struct the_nilfs *nilfs; struct nilfs_root *fsroot; - struct backing_dev_info *bdi; __u64 cno; int err; @@ -1077,8 +1076,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent) sb->s_time_gran = 1; sb->s_max_links = NILFS_LINK_MAX; - bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; - sb->s_bdi = bdi ? : &default_backing_dev_info; + sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info; err = load_nilfs(nilfs, sb); if (err) diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c index 643faa4..1da9b2d 100644 --- a/fs/ntfs/file.c +++ b/fs/ntfs/file.c @@ -19,6 +19,7 @@ * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +#include <linux/backing-dev.h> #include <linux/buffer_head.h> #include <linux/gfp.h> #include <linux/pagemap.h> @@ -2091,7 +2092,7 @@ static ssize_t ntfs_file_aio_write_nolock(struct kiocb *iocb, count = iov_length(iov, nr_segs); pos = *ppos; /* We can write back this queue in page reclaim. */ - current->backing_dev_info = mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); written = 0; err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c index 57c40e3..061ba6a 100644 --- a/fs/ocfs2/dlmfs/dlmfs.c +++ b/fs/ocfs2/dlmfs/dlmfs.c @@ -390,12 +390,6 @@ clear_fields: ip->ip_conn = NULL; } -static struct backing_dev_info dlmfs_backing_dev_info = { - .name = "ocfs2-dlmfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, -}; - static struct inode *dlmfs_get_root_inode(struct super_block *sb) { struct inode *inode = new_inode(sb); @@ -404,7 +398,6 @@ static struct inode *dlmfs_get_root_inode(struct super_block *sb) if (inode) { inode->i_ino = get_next_ino(); inode_init_owner(inode, NULL, mode); - inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inc_nlink(inode); @@ -428,7 +421,6 @@ static struct inode *dlmfs_get_inode(struct inode *parent, inode->i_ino = get_next_ino(); inode_init_owner(inode, parent, mode); - inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; ip = DLMFS_I(inode); @@ -643,10 +635,6 @@ static int __init init_dlmfs_fs(void) int status; int cleanup_inode = 0, cleanup_worker = 0; - status = bdi_init(&dlmfs_backing_dev_info); - if (status) - return status; - dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache", sizeof(struct dlmfs_inode_private), 0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| @@ -673,7 +661,6 @@ bail: kmem_cache_destroy(dlmfs_inode_cache); if (cleanup_worker) destroy_workqueue(user_dlm_worker); - bdi_destroy(&dlmfs_backing_dev_info); } else printk("OCFS2 User DLM kernel interface loaded\n"); return status; @@ -693,7 +680,6 @@ static void __exit exit_dlmfs_fs(void) rcu_barrier(); kmem_cache_destroy(dlmfs_inode_cache); - bdi_destroy(&dlmfs_backing_dev_info); } MODULE_AUTHOR("Oracle"); diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 245db4f..e0f04d5 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2363,7 +2363,7 @@ relock: goto out_dio; } } else { - current->backing_dev_info = file->f_mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); written = generic_perform_write(file, from, *ppos); if (likely(written >= 0)) iocb->ki_pos = *ppos + written; diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c index bbafbde..f6ab41b 100644 --- a/fs/ramfs/file-nommu.c +++ b/fs/ramfs/file-nommu.c @@ -34,7 +34,14 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file, unsigned long flags); static int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma); +static unsigned ramfs_mmap_capabilities(struct file *file) +{ + return NOMMU_MAP_DIRECT | NOMMU_MAP_COPY | NOMMU_MAP_READ | + NOMMU_MAP_WRITE | NOMMU_MAP_EXEC; +} + const struct file_operations ramfs_file_operations = { + .mmap_capabilities = ramfs_mmap_capabilities, .mmap = ramfs_nommu_mmap, .get_unmapped_area = ramfs_nommu_get_unmapped_area, .read = new_sync_read, diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index d365b1c..889d558 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -50,14 +50,6 @@ static const struct address_space_operations ramfs_aops = { .set_page_dirty = __set_page_dirty_no_writeback, }; -static struct backing_dev_info ramfs_backing_dev_info = { - .name = "ramfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | - BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY | - BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP, -}; - struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir, umode_t mode, dev_t dev) { @@ -67,7 +59,6 @@ struct inode *ramfs_get_inode(struct super_block *sb, inode->i_ino = get_next_ino(); inode_init_owner(inode, dir, mode); inode->i_mapping->a_ops = &ramfs_aops; - inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info; mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER); mapping_set_unevictable(inode->i_mapping); inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; @@ -267,19 +258,9 @@ static struct file_system_type ramfs_fs_type = { int __init init_ramfs_fs(void) { static unsigned long once; - int err; if (test_and_set_bit(0, &once)) return 0; - - err = bdi_init(&ramfs_backing_dev_info); - if (err) - return err; - - err = register_filesystem(&ramfs_fs_type); - if (err) - bdi_destroy(&ramfs_backing_dev_info); - - return err; + return register_filesystem(&ramfs_fs_type); } fs_initcall(init_ramfs_fs); diff --git a/fs/romfs/mmap-nommu.c b/fs/romfs/mmap-nommu.c index ea06c75..7da9e21 100644 --- a/fs/romfs/mmap-nommu.c +++ b/fs/romfs/mmap-nommu.c @@ -70,6 +70,15 @@ static int romfs_mmap(struct file *file, struct vm_area_struct *vma) return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -ENOSYS; } +static unsigned romfs_mmap_capabilities(struct file *file) +{ + struct mtd_info *mtd = file_inode(file)->i_sb->s_mtd; + + if (!mtd) + return NOMMU_MAP_COPY; + return mtd_mmap_capabilities(mtd); +} + const struct file_operations romfs_ro_fops = { .llseek = generic_file_llseek, .read = new_sync_read, @@ -77,4 +86,5 @@ const struct file_operations romfs_ro_fops = { .splice_read = generic_file_splice_read, .mmap = romfs_mmap, .get_unmapped_area = romfs_get_unmapped_area, + .mmap_capabilities = romfs_mmap_capabilities, }; diff --git a/fs/romfs/super.c b/fs/romfs/super.c index e98dd88..268733c 100644 --- a/fs/romfs/super.c +++ b/fs/romfs/super.c @@ -355,9 +355,6 @@ static struct inode *romfs_iget(struct super_block *sb, unsigned long pos) case ROMFH_REG: i->i_fop = &romfs_ro_fops; i->i_data.a_ops = &romfs_aops; - if (i->i_sb->s_mtd) - i->i_data.backing_dev_info = - i->i_sb->s_mtd->backing_dev_info; if (nextfh & ROMFH_EXEC) mode |= S_IXUGO; break; @@ -36,8 +36,8 @@ #include "internal.h" -LIST_HEAD(super_blocks); -DEFINE_SPINLOCK(sb_lock); +static LIST_HEAD(super_blocks); +static DEFINE_SPINLOCK(sb_lock); static char *sb_writers_name[SB_FREEZE_LEVELS] = { "sb_writers", @@ -185,8 +185,8 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags) } init_waitqueue_head(&s->s_writers.wait); init_waitqueue_head(&s->s_writers.wait_unfrozen); + s->s_bdi = &noop_backing_dev_info; s->s_flags = flags; - s->s_bdi = &default_backing_dev_info; INIT_HLIST_NODE(&s->s_instances); INIT_HLIST_BL_HEAD(&s->s_anon); INIT_LIST_HEAD(&s->s_inodes); @@ -863,10 +863,7 @@ EXPORT_SYMBOL(free_anon_bdev); int set_anon_super(struct super_block *s, void *data) { - int error = get_anon_bdev(&s->s_dev); - if (!error) - s->s_bdi = &noop_backing_dev_info; - return error; + return get_anon_bdev(&s->s_dev); } EXPORT_SYMBOL(set_anon_super); @@ -1111,7 +1108,6 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data) sb = root->d_sb; BUG_ON(!sb); WARN_ON(!sb->s_bdi); - WARN_ON(sb->s_bdi == &default_backing_dev_info); sb->s_flags |= MS_BORN; error = security_sb_kern_mount(sb, flags, secdata); diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index ea41649..c49b198 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -108,8 +108,6 @@ struct inode *ubifs_new_inode(struct ubifs_info *c, const struct inode *dir, inode->i_mtime = inode->i_atime = inode->i_ctime = ubifs_current_time(inode); inode->i_mapping->nrpages = 0; - /* Disable readahead */ - inode->i_mapping->backing_dev_info = &c->bdi; switch (mode & S_IFMT) { case S_IFREG: diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 106bf20..6197154 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -156,9 +156,6 @@ struct inode *ubifs_iget(struct super_block *sb, unsigned long inum) if (err) goto out_invalid; - /* Disable read-ahead */ - inode->i_mapping->backing_dev_info = &c->bdi; - switch (inode->i_mode & S_IFMT) { case S_IFREG: inode->i_mapping->a_ops = &ubifs_file_address_operations; @@ -2017,7 +2014,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent) * Read-ahead will be disabled because @c->bdi.ra_pages is 0. */ c->bdi.name = "ubifs", - c->bdi.capabilities = BDI_CAP_MAP_COPY; + c->bdi.capabilities = 0; err = bdi_init(&c->bdi); if (err) goto out_close; diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index f2d05a1..1cdba95 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -735,7 +735,7 @@ xfs_file_buffered_aio_write( iov_iter_truncate(from, count); /* We can write back this queue in page reclaim */ - current->backing_dev_info = mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); write_retry: trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, 0); diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 5da6012..d94077f 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -106,6 +106,8 @@ struct backing_dev_info { #endif }; +struct backing_dev_info *inode_to_bdi(struct inode *inode); + int __must_check bdi_init(struct backing_dev_info *bdi); void bdi_destroy(struct backing_dev_info *bdi); @@ -114,7 +116,7 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent, const char *fmt, ...); int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev); void bdi_unregister(struct backing_dev_info *bdi); -int __must_check bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int); +int __must_check bdi_setup_and_register(struct backing_dev_info *, char *); void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages, enum wb_reason reason); void bdi_start_background_writeback(struct backing_dev_info *bdi); @@ -228,46 +230,17 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting * BDI_CAP_NO_WRITEBACK: Don't write pages back * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages - * - * These flags let !MMU mmap() govern direct device mapping vs immediate - * copying more easily for MAP_PRIVATE, especially for ROM filesystems. - * - * BDI_CAP_MAP_COPY: Copy can be mapped (MAP_PRIVATE) - * BDI_CAP_MAP_DIRECT: Can be mapped directly (MAP_SHARED) - * BDI_CAP_READ_MAP: Can be mapped for reading - * BDI_CAP_WRITE_MAP: Can be mapped for writing - * BDI_CAP_EXEC_MAP: Can be mapped for execution - * - * BDI_CAP_SWAP_BACKED: Count shmem/tmpfs objects as swap-backed. - * * BDI_CAP_STRICTLIMIT: Keep number of dirty pages below bdi threshold. */ #define BDI_CAP_NO_ACCT_DIRTY 0x00000001 #define BDI_CAP_NO_WRITEBACK 0x00000002 -#define BDI_CAP_MAP_COPY 0x00000004 -#define BDI_CAP_MAP_DIRECT 0x00000008 -#define BDI_CAP_READ_MAP 0x00000010 -#define BDI_CAP_WRITE_MAP 0x00000020 -#define BDI_CAP_EXEC_MAP 0x00000040 -#define BDI_CAP_NO_ACCT_WB 0x00000080 -#define BDI_CAP_SWAP_BACKED 0x00000100 -#define BDI_CAP_STABLE_WRITES 0x00000200 -#define BDI_CAP_STRICTLIMIT 0x00000400 - -#define BDI_CAP_VMFLAGS \ - (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) +#define BDI_CAP_NO_ACCT_WB 0x00000004 +#define BDI_CAP_STABLE_WRITES 0x00000008 +#define BDI_CAP_STRICTLIMIT 0x00000010 #define BDI_CAP_NO_ACCT_AND_WRITEBACK \ (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) -#if defined(VM_MAYREAD) && \ - (BDI_CAP_READ_MAP != VM_MAYREAD || \ - BDI_CAP_WRITE_MAP != VM_MAYWRITE || \ - BDI_CAP_EXEC_MAP != VM_MAYEXEC) -#error please change backing_dev_info::capabilities flags -#endif - -extern struct backing_dev_info default_backing_dev_info; extern struct backing_dev_info noop_backing_dev_info; int writeback_in_progress(struct backing_dev_info *bdi); @@ -329,24 +302,14 @@ static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) BDI_CAP_NO_WRITEBACK)); } -static inline bool bdi_cap_swap_backed(struct backing_dev_info *bdi) -{ - return bdi->capabilities & BDI_CAP_SWAP_BACKED; -} - static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) { - return bdi_cap_writeback_dirty(mapping->backing_dev_info); + return bdi_cap_writeback_dirty(inode_to_bdi(mapping->host)); } static inline bool mapping_cap_account_dirty(struct address_space *mapping) { - return bdi_cap_account_dirty(mapping->backing_dev_info); -} - -static inline bool mapping_cap_swap_backed(struct address_space *mapping) -{ - return bdi_cap_swap_backed(mapping->backing_dev_info); + return bdi_cap_account_dirty(inode_to_bdi(mapping->host)); } static inline int bdi_sched_wait(void *word) diff --git a/include/linux/cdev.h b/include/linux/cdev.h index fb45919..f876361 100644 --- a/include/linux/cdev.h +++ b/include/linux/cdev.h @@ -30,6 +30,4 @@ void cdev_del(struct cdev *); void cd_forget(struct inode *); -extern struct backing_dev_info directly_mappable_cdev_bdi; - #endif diff --git a/include/linux/fs.h b/include/linux/fs.h index cdcb1e9..ec0f1dc 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -34,6 +34,7 @@ #include <asm/byteorder.h> #include <uapi/linux/fs.h> +struct backing_dev_info; struct export_operations; struct hd_geometry; struct iovec; @@ -394,7 +395,6 @@ int pagecache_write_end(struct file *, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata); -struct backing_dev_info; struct address_space { struct inode *host; /* owner: inode, block_device */ struct radix_tree_root page_tree; /* radix tree of all pages */ @@ -408,7 +408,6 @@ struct address_space { pgoff_t writeback_index;/* writeback starts here */ const struct address_space_operations *a_ops; /* methods */ unsigned long flags; /* error bits/gfp mask */ - struct backing_dev_info *backing_dev_info; /* device readahead, etc */ spinlock_t private_lock; /* for use by the address_space */ struct list_head private_list; /* ditto */ void *private_data; /* ditto */ @@ -1201,8 +1200,6 @@ struct mm_struct; #define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ #define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ -extern struct list_head super_blocks; -extern spinlock_t sb_lock; /* Possible states of 'frozen' field */ enum { @@ -1519,6 +1516,26 @@ struct block_device_operations; #define HAVE_COMPAT_IOCTL 1 #define HAVE_UNLOCKED_IOCTL 1 +/* + * These flags let !MMU mmap() govern direct device mapping vs immediate + * copying more easily for MAP_PRIVATE, especially for ROM filesystems. + * + * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) + * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) + * NOMMU_MAP_READ: Can be mapped for reading + * NOMMU_MAP_WRITE: Can be mapped for writing + * NOMMU_MAP_EXEC: Can be mapped for execution + */ +#define NOMMU_MAP_COPY 0x00000001 +#define NOMMU_MAP_DIRECT 0x00000008 +#define NOMMU_MAP_READ VM_MAYREAD +#define NOMMU_MAP_WRITE VM_MAYWRITE +#define NOMMU_MAP_EXEC VM_MAYEXEC + +#define NOMMU_VMFLAGS \ + (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) + + struct iov_iter; struct file_operations { @@ -1553,6 +1570,9 @@ struct file_operations { long (*fallocate)(struct file *file, int mode, loff_t offset, loff_t len); void (*show_fdinfo)(struct seq_file *m, struct file *f); +#ifndef CONFIG_MMU + unsigned (*mmap_capabilities)(struct file *); +#endif }; struct inode_operations { diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 031ff3a..3301c4c 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -408,4 +408,6 @@ static inline int mtd_is_bitflip_or_eccerr(int err) { return mtd_is_bitflip(err) || mtd_is_eccerr(err); } +unsigned mtd_mmap_capabilities(struct mtd_info *mtd); + #endif /* __MTD_MTD_H__ */ diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index cee02d6..0e93109 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -47,7 +47,7 @@ TRACE_EVENT(writeback_dirty_page, TP_fast_assign( strncpy(__entry->name, - mapping ? dev_name(mapping->backing_dev_info->dev) : "(unknown)", 32); + mapping ? dev_name(inode_to_bdi(mapping->host)->dev) : "(unknown)", 32); __entry->ino = mapping ? mapping->host->i_ino : 0; __entry->index = page->index; ), @@ -72,7 +72,7 @@ DECLARE_EVENT_CLASS(writeback_dirty_inode_template, ), TP_fast_assign( - struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(inode); /* may be called for files on pseudo FSes w/ unregistered bdi */ strncpy(__entry->name, @@ -116,7 +116,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template, TP_fast_assign( strncpy(__entry->name, - dev_name(inode->i_mapping->backing_dev_info->dev), 32); + dev_name(inode_to_bdi(inode)->dev), 32); __entry->ino = inode->i_ino; __entry->sync_mode = wbc->sync_mode; ), @@ -156,10 +156,8 @@ DECLARE_EVENT_CLASS(writeback_work_class, __field(int, reason) ), TP_fast_assign( - struct device *dev = bdi->dev; - if (!dev) - dev = default_backing_dev_info.dev; - strncpy(__entry->name, dev_name(dev), 32); + strncpy(__entry->name, + bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32); __entry->nr_pages = work->nr_pages; __entry->sb_dev = work->sb ? work->sb->s_dev : 0; __entry->sync_mode = work->sync_mode; diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 0ae0df5..7690ec7 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -14,19 +14,10 @@ static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); -struct backing_dev_info default_backing_dev_info = { - .name = "default", - .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE, - .state = 0, - .capabilities = BDI_CAP_MAP_COPY, -}; -EXPORT_SYMBOL_GPL(default_backing_dev_info); - struct backing_dev_info noop_backing_dev_info = { .name = "noop", .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; -EXPORT_SYMBOL_GPL(noop_backing_dev_info); static struct class *bdi_class; @@ -40,17 +31,6 @@ LIST_HEAD(bdi_list); /* bdi_wq serves all asynchronous writeback tasks */ struct workqueue_struct *bdi_wq; -static void bdi_lock_two(struct bdi_writeback *wb1, struct bdi_writeback *wb2) -{ - if (wb1 < wb2) { - spin_lock(&wb1->list_lock); - spin_lock_nested(&wb2->list_lock, 1); - } else { - spin_lock(&wb2->list_lock); - spin_lock_nested(&wb1->list_lock, 1); - } -} - #ifdef CONFIG_DEBUG_FS #include <linux/debugfs.h> #include <linux/seq_file.h> @@ -264,9 +244,6 @@ static int __init default_bdi_init(void) if (!bdi_wq) return -ENOMEM; - err = bdi_init(&default_backing_dev_info); - if (!err) - bdi_register(&default_backing_dev_info, NULL, "default"); err = bdi_init(&noop_backing_dev_info); return err; @@ -355,19 +332,19 @@ EXPORT_SYMBOL(bdi_register_dev); */ static void bdi_wb_shutdown(struct backing_dev_info *bdi) { - if (!bdi_cap_writeback_dirty(bdi)) + /* Make sure nobody queues further work */ + spin_lock_bh(&bdi->wb_lock); + if (!test_and_clear_bit(BDI_registered, &bdi->state)) { + spin_unlock_bh(&bdi->wb_lock); return; + } + spin_unlock_bh(&bdi->wb_lock); /* * Make sure nobody finds us on the bdi_list anymore */ bdi_remove_from_list(bdi); - /* Make sure nobody queues further work */ - spin_lock_bh(&bdi->wb_lock); - clear_bit(BDI_registered, &bdi->state); - spin_unlock_bh(&bdi->wb_lock); - /* * Drain work list and shutdown the delayed_work. At this point, * @bdi->bdi_list is empty telling bdi_Writeback_workfn() that @bdi @@ -375,37 +352,22 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi) */ mod_delayed_work(bdi_wq, &bdi->wb.dwork, 0); flush_delayed_work(&bdi->wb.dwork); - WARN_ON(!list_empty(&bdi->work_list)); - WARN_ON(delayed_work_pending(&bdi->wb.dwork)); } /* - * This bdi is going away now, make sure that no super_blocks point to it + * Called when the device behind @bdi has been removed or ejected. + * + * We can't really do much here except for reducing the dirty ratio at + * the moment. In the future we should be able to set a flag so that + * the filesystem can handle errors at mark_inode_dirty time instead + * of only at writeback time. */ -static void bdi_prune_sb(struct backing_dev_info *bdi) -{ - struct super_block *sb; - - spin_lock(&sb_lock); - list_for_each_entry(sb, &super_blocks, s_list) { - if (sb->s_bdi == bdi) - sb->s_bdi = &default_backing_dev_info; - } - spin_unlock(&sb_lock); -} - void bdi_unregister(struct backing_dev_info *bdi) { - if (bdi->dev) { - bdi_set_min_ratio(bdi, 0); - trace_writeback_bdi_unregister(bdi); - bdi_prune_sb(bdi); + if (WARN_ON_ONCE(!bdi->dev)) + return; - bdi_wb_shutdown(bdi); - bdi_debug_unregister(bdi); - device_unregister(bdi->dev); - bdi->dev = NULL; - } + bdi_set_min_ratio(bdi, 0); } EXPORT_SYMBOL(bdi_unregister); @@ -474,37 +436,19 @@ void bdi_destroy(struct backing_dev_info *bdi) { int i; - /* - * Splice our entries to the default_backing_dev_info. This - * condition shouldn't happen. @wb must be empty at this point and - * dirty inodes on it might cause other issues. This workaround is - * added by ce5f8e779519 ("writeback: splice dirty inode entries to - * default bdi on bdi_destroy()") without root-causing the issue. - * - * http://lkml.kernel.org/g/1253038617-30204-11-git-send-email-jens.axboe@oracle.com - * http://thread.gmane.org/gmane.linux.file-systems/35341/focus=35350 - * - * We should probably add WARN_ON() to find out whether it still - * happens and track it down if so. - */ - if (bdi_has_dirty_io(bdi)) { - struct bdi_writeback *dst = &default_backing_dev_info.wb; - - bdi_lock_two(&bdi->wb, dst); - list_splice(&bdi->wb.b_dirty, &dst->b_dirty); - list_splice(&bdi->wb.b_io, &dst->b_io); - list_splice(&bdi->wb.b_more_io, &dst->b_more_io); - spin_unlock(&bdi->wb.list_lock); - spin_unlock(&dst->list_lock); - } - - bdi_unregister(bdi); + bdi_wb_shutdown(bdi); + WARN_ON(!list_empty(&bdi->work_list)); WARN_ON(delayed_work_pending(&bdi->wb.dwork)); + if (bdi->dev) { + bdi_debug_unregister(bdi); + device_unregister(bdi->dev); + bdi->dev = NULL; + } + for (i = 0; i < NR_BDI_STAT_ITEMS; i++) percpu_counter_destroy(&bdi->bdi_stat[i]); - fprop_local_destroy_percpu(&bdi->completions); } EXPORT_SYMBOL(bdi_destroy); @@ -513,13 +457,12 @@ EXPORT_SYMBOL(bdi_destroy); * For use from filesystems to quickly init and register a bdi associated * with dirty writeback */ -int bdi_setup_and_register(struct backing_dev_info *bdi, char *name, - unsigned int cap) +int bdi_setup_and_register(struct backing_dev_info *bdi, char *name) { int err; bdi->name = name; - bdi->capabilities = cap; + bdi->capabilities = 0; err = bdi_init(bdi); if (err) return err; diff --git a/mm/fadvise.c b/mm/fadvise.c index 2ad7adf..fac23ec 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -73,7 +73,7 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice) else endbyte--; /* inclusive */ - bdi = mapping->backing_dev_info; + bdi = inode_to_bdi(mapping->host); switch (advice) { case POSIX_FADV_NORMAL: @@ -113,7 +113,7 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice) case POSIX_FADV_NOREUSE: break; case POSIX_FADV_DONTNEED: - if (!bdi_write_congested(mapping->backing_dev_info)) + if (!bdi_write_congested(bdi)) __filemap_fdatawrite_range(mapping, offset, endbyte, WB_SYNC_NONE); diff --git a/mm/filemap.c b/mm/filemap.c index bf7a271..d9f5336 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -211,7 +211,7 @@ void __delete_from_page_cache(struct page *page, void *shadow) */ if (PageDirty(page) && mapping_cap_account_dirty(mapping)) { dec_zone_page_state(page, NR_FILE_DIRTY); - dec_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE); + dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE); } } @@ -2564,7 +2564,7 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from) size_t count = iov_iter_count(from); /* We can write back this queue in page reclaim */ - current->backing_dev_info = mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); if (err) goto out; diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c index 70c09da..c175f9f 100644 --- a/mm/filemap_xip.c +++ b/mm/filemap_xip.c @@ -9,6 +9,7 @@ */ #include <linux/fs.h> +#include <linux/backing-dev.h> #include <linux/pagemap.h> #include <linux/export.h> #include <linux/uio.h> @@ -409,7 +410,7 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len, count = len; /* We can write back this queue in page reclaim */ - current->backing_dev_info = mapping->backing_dev_info; + current->backing_dev_info = inode_to_bdi(inode); ret = generic_write_checks(filp, &pos, &count, S_ISBLK(inode->i_mode)); if (ret) diff --git a/mm/madvise.c b/mm/madvise.c index d79fb5e..1077cbd 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -222,19 +222,22 @@ static long madvise_willneed(struct vm_area_struct *vma, struct file *file = vma->vm_file; #ifdef CONFIG_SWAP - if (!file || mapping_cap_swap_backed(file->f_mapping)) { + if (!file) { *prev = vma; - if (!file) - force_swapin_readahead(vma, start, end); - else - force_shm_swapin_readahead(vma, start, end, - file->f_mapping); + force_swapin_readahead(vma, start, end); return 0; } -#endif + if (shmem_mapping(file->f_mapping)) { + *prev = vma; + force_shm_swapin_readahead(vma, start, end, + file->f_mapping); + return 0; + } +#else if (!file) return -EBADF; +#endif if (file->f_mapping->a_ops->get_xip_mem) { /* no bad return value, but ignore advice */ @@ -980,9 +980,6 @@ static int validate_mmap_request(struct file *file, return -EOVERFLOW; if (file) { - /* validate file mapping requests */ - struct address_space *mapping; - /* files must support mmap */ if (!file->f_op->mmap) return -ENODEV; @@ -991,28 +988,22 @@ static int validate_mmap_request(struct file *file, * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ - mapping = file->f_mapping; - if (!mapping) - mapping = file_inode(file)->i_mapping; - - capabilities = 0; - if (mapping && mapping->backing_dev_info) - capabilities = mapping->backing_dev_info->capabilities; - - if (!capabilities) { + if (file->f_op->mmap_capabilities) { + capabilities = file->f_op->mmap_capabilities(file); + } else { /* no explicit capabilities set, so assume some * defaults */ switch (file_inode(file)->i_mode & S_IFMT) { case S_IFREG: case S_IFBLK: - capabilities = BDI_CAP_MAP_COPY; + capabilities = NOMMU_MAP_COPY; break; case S_IFCHR: capabilities = - BDI_CAP_MAP_DIRECT | - BDI_CAP_READ_MAP | - BDI_CAP_WRITE_MAP; + NOMMU_MAP_DIRECT | + NOMMU_MAP_READ | + NOMMU_MAP_WRITE; break; default: @@ -1023,9 +1014,9 @@ static int validate_mmap_request(struct file *file, /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) - capabilities &= ~BDI_CAP_MAP_DIRECT; + capabilities &= ~NOMMU_MAP_DIRECT; if (!file->f_op->read) - capabilities &= ~BDI_CAP_MAP_COPY; + capabilities &= ~NOMMU_MAP_COPY; /* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) @@ -1044,29 +1035,29 @@ static int validate_mmap_request(struct file *file, if (locks_verify_locked(file)) return -EAGAIN; - if (!(capabilities & BDI_CAP_MAP_DIRECT)) + if (!(capabilities & NOMMU_MAP_DIRECT)) return -ENODEV; /* we mustn't privatise shared mappings */ - capabilities &= ~BDI_CAP_MAP_COPY; + capabilities &= ~NOMMU_MAP_COPY; } else { /* we're going to read the file into private memory we * allocate */ - if (!(capabilities & BDI_CAP_MAP_COPY)) + if (!(capabilities & NOMMU_MAP_COPY)) return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) - capabilities &= ~BDI_CAP_MAP_DIRECT; + capabilities &= ~NOMMU_MAP_DIRECT; } - if (capabilities & BDI_CAP_MAP_DIRECT) { - if (((prot & PROT_READ) && !(capabilities & BDI_CAP_READ_MAP)) || - ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) || - ((prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP)) + if (capabilities & NOMMU_MAP_DIRECT) { + if (((prot & PROT_READ) && !(capabilities & NOMMU_MAP_READ)) || + ((prot & PROT_WRITE) && !(capabilities & NOMMU_MAP_WRITE)) || + ((prot & PROT_EXEC) && !(capabilities & NOMMU_MAP_EXEC)) ) { - capabilities &= ~BDI_CAP_MAP_DIRECT; + capabilities &= ~NOMMU_MAP_DIRECT; if (flags & MAP_SHARED) { printk(KERN_WARNING "MAP_SHARED not completely supported on !MMU\n"); @@ -1083,21 +1074,21 @@ static int validate_mmap_request(struct file *file, } else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { /* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { - if (capabilities & BDI_CAP_EXEC_MAP) + if (capabilities & NOMMU_MAP_EXEC) prot |= PROT_EXEC; } } else if ((prot & PROT_READ) && (prot & PROT_EXEC) && - !(capabilities & BDI_CAP_EXEC_MAP) + !(capabilities & NOMMU_MAP_EXEC) ) { /* backing file is not executable, try to copy */ - capabilities &= ~BDI_CAP_MAP_DIRECT; + capabilities &= ~NOMMU_MAP_DIRECT; } } else { /* anonymous mappings are always memory backed and can be * privately mapped */ - capabilities = BDI_CAP_MAP_COPY; + capabilities = NOMMU_MAP_COPY; /* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && @@ -1129,7 +1120,7 @@ static unsigned long determine_vm_flags(struct file *file, vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags); /* vm_flags |= mm->def_flags; */ - if (!(capabilities & BDI_CAP_MAP_DIRECT)) { + if (!(capabilities & NOMMU_MAP_DIRECT)) { /* attempt to share read-only copies of mapped file chunks */ vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; if (file && !(prot & PROT_WRITE)) @@ -1138,7 +1129,7 @@ static unsigned long determine_vm_flags(struct file *file, /* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ - vm_flags |= VM_MAYSHARE | (capabilities & BDI_CAP_VMFLAGS); + vm_flags |= VM_MAYSHARE | (capabilities & NOMMU_VMFLAGS); if (flags & MAP_SHARED) vm_flags |= VM_SHARED; } @@ -1191,7 +1182,7 @@ static int do_mmap_private(struct vm_area_struct *vma, * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ - if (capabilities & BDI_CAP_MAP_DIRECT) { + if (capabilities & NOMMU_MAP_DIRECT) { ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); if (ret == 0) { /* shouldn't return success if we're not sharing */ @@ -1380,7 +1371,7 @@ unsigned long do_mmap_pgoff(struct file *file, if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ - if (!(capabilities & BDI_CAP_MAP_DIRECT)) + if (!(capabilities & NOMMU_MAP_DIRECT)) goto sharing_violation; continue; } @@ -1419,7 +1410,7 @@ unsigned long do_mmap_pgoff(struct file *file, * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ - if (capabilities & BDI_CAP_MAP_DIRECT) { + if (capabilities & NOMMU_MAP_DIRECT) { addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); if (IS_ERR_VALUE(addr)) { @@ -1431,10 +1422,10 @@ unsigned long do_mmap_pgoff(struct file *file, * the mapping so we'll have to attempt to copy * it */ ret = -ENODEV; - if (!(capabilities & BDI_CAP_MAP_COPY)) + if (!(capabilities & NOMMU_MAP_COPY)) goto error_just_free; - capabilities &= ~BDI_CAP_MAP_DIRECT; + capabilities &= ~NOMMU_MAP_DIRECT; } else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; @@ -1445,7 +1436,7 @@ unsigned long do_mmap_pgoff(struct file *file, vma->vm_region = region; /* set up the mapping - * - the region is filled in if BDI_CAP_MAP_DIRECT is still set + * - the region is filled in if NOMMU_MAP_DIRECT is still set */ if (file && vma->vm_flags & VM_SHARED) ret = do_mmap_shared_file(vma); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 6a73e47..45e187b 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1351,7 +1351,7 @@ static void balance_dirty_pages(struct address_space *mapping, unsigned long task_ratelimit; unsigned long dirty_ratelimit; unsigned long pos_ratio; - struct backing_dev_info *bdi = mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(mapping->host); bool strictlimit = bdi->capabilities & BDI_CAP_STRICTLIMIT; unsigned long start_time = jiffies; @@ -1574,7 +1574,7 @@ DEFINE_PER_CPU(int, dirty_throttle_leaks) = 0; */ void balance_dirty_pages_ratelimited(struct address_space *mapping) { - struct backing_dev_info *bdi = mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(mapping->host); int ratelimit; int *p; @@ -1929,7 +1929,7 @@ continue_unlock: if (!clear_page_dirty_for_io(page)) goto continue_unlock; - trace_wbc_writepage(wbc, mapping->backing_dev_info); + trace_wbc_writepage(wbc, inode_to_bdi(mapping->host)); ret = (*writepage)(page, wbc, data); if (unlikely(ret)) { if (ret == AOP_WRITEPAGE_ACTIVATE) { @@ -2094,10 +2094,12 @@ void account_page_dirtied(struct page *page, struct address_space *mapping) trace_writeback_dirty_page(page, mapping); if (mapping_cap_account_dirty(mapping)) { + struct backing_dev_info *bdi = inode_to_bdi(mapping->host); + __inc_zone_page_state(page, NR_FILE_DIRTY); __inc_zone_page_state(page, NR_DIRTIED); - __inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE); - __inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED); + __inc_bdi_stat(bdi, BDI_RECLAIMABLE); + __inc_bdi_stat(bdi, BDI_DIRTIED); task_io_account_write(PAGE_CACHE_SIZE); current->nr_dirtied++; this_cpu_inc(bdp_ratelimits); @@ -2156,7 +2158,7 @@ void account_page_redirty(struct page *page) if (mapping && mapping_cap_account_dirty(mapping)) { current->nr_dirtied--; dec_zone_page_state(page, NR_DIRTIED); - dec_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED); + dec_bdi_stat(inode_to_bdi(mapping->host), BDI_DIRTIED); } } EXPORT_SYMBOL(account_page_redirty); @@ -2298,7 +2300,7 @@ int clear_page_dirty_for_io(struct page *page) */ if (TestClearPageDirty(page)) { dec_zone_page_state(page, NR_FILE_DIRTY); - dec_bdi_stat(mapping->backing_dev_info, + dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE); return 1; } @@ -2316,7 +2318,7 @@ int test_clear_page_writeback(struct page *page) memcg = mem_cgroup_begin_page_stat(page); if (mapping) { - struct backing_dev_info *bdi = mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(mapping->host); unsigned long flags; spin_lock_irqsave(&mapping->tree_lock, flags); @@ -2351,7 +2353,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) memcg = mem_cgroup_begin_page_stat(page); if (mapping) { - struct backing_dev_info *bdi = mapping->backing_dev_info; + struct backing_dev_info *bdi = inode_to_bdi(mapping->host); unsigned long flags; spin_lock_irqsave(&mapping->tree_lock, flags); @@ -2405,12 +2407,7 @@ EXPORT_SYMBOL(mapping_tagged); */ void wait_for_stable_page(struct page *page) { - struct address_space *mapping = page_mapping(page); - struct backing_dev_info *bdi = mapping->backing_dev_info; - - if (!bdi_cap_stable_pages_required(bdi)) - return; - - wait_on_page_writeback(page); + if (bdi_cap_stable_pages_required(inode_to_bdi(page->mapping->host))) + wait_on_page_writeback(page); } EXPORT_SYMBOL_GPL(wait_for_stable_page); diff --git a/mm/readahead.c b/mm/readahead.c index 17b9172..9356758 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -27,7 +27,7 @@ void file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping) { - ra->ra_pages = mapping->backing_dev_info->ra_pages; + ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages; ra->prev_pos = -1; } EXPORT_SYMBOL_GPL(file_ra_state_init); @@ -541,7 +541,7 @@ page_cache_async_readahead(struct address_space *mapping, /* * Defer asynchronous read-ahead on IO congestion. */ - if (bdi_read_congested(mapping->backing_dev_info)) + if (bdi_read_congested(inode_to_bdi(mapping->host))) return; /* do read-ahead */ @@ -191,11 +191,6 @@ static const struct inode_operations shmem_dir_inode_operations; static const struct inode_operations shmem_special_inode_operations; static const struct vm_operations_struct shmem_vm_ops; -static struct backing_dev_info shmem_backing_dev_info __read_mostly = { - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED, -}; - static LIST_HEAD(shmem_swaplist); static DEFINE_MUTEX(shmem_swaplist_mutex); @@ -765,11 +760,11 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc) goto redirty; /* - * shmem_backing_dev_info's capabilities prevent regular writeback or - * sync from ever calling shmem_writepage; but a stacking filesystem - * might use ->writepage of its underlying filesystem, in which case - * tmpfs should write out to swap only in response to memory pressure, - * and not for the writeback threads or sync. + * Our capabilities prevent regular writeback or sync from ever calling + * shmem_writepage; but a stacking filesystem might use ->writepage of + * its underlying filesystem, in which case tmpfs should write out to + * swap only in response to memory pressure, and not for the writeback + * threads or sync. */ if (!wbc->for_reclaim) { WARN_ON_ONCE(1); /* Still happens? Tell us about it! */ @@ -1415,7 +1410,6 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode inode->i_ino = get_next_ino(); inode_init_owner(inode, dir, mode); inode->i_blocks = 0; - inode->i_mapping->backing_dev_info = &shmem_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; inode->i_generation = get_seconds(); info = SHMEM_I(inode); @@ -1461,7 +1455,7 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode bool shmem_mapping(struct address_space *mapping) { - return mapping->backing_dev_info == &shmem_backing_dev_info; + return mapping->host->i_sb->s_op == &shmem_ops; } #ifdef CONFIG_TMPFS @@ -3225,10 +3219,6 @@ int __init shmem_init(void) if (shmem_inode_cachep) return 0; - error = bdi_init(&shmem_backing_dev_info); - if (error) - goto out4; - error = shmem_init_inodecache(); if (error) goto out3; @@ -3252,8 +3242,6 @@ out1: out2: shmem_destroy_inodecache(); out3: - bdi_destroy(&shmem_backing_dev_info); -out4: shm_mnt = ERR_PTR(error); return error; } @@ -1138,8 +1138,6 @@ void __init swap_setup(void) #ifdef CONFIG_SWAP int i; - if (bdi_init(swapper_spaces[0].backing_dev_info)) - panic("Failed to init swap bdi"); for (i = 0; i < MAX_SWAPFILES; i++) spin_lock_init(&swapper_spaces[i].tree_lock); #endif diff --git a/mm/swap_state.c b/mm/swap_state.c index 9711342..405923f 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -32,17 +32,11 @@ static const struct address_space_operations swap_aops = { #endif }; -static struct backing_dev_info swap_backing_dev_info = { - .name = "swap", - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED, -}; - struct address_space swapper_spaces[MAX_SWAPFILES] = { [0 ... MAX_SWAPFILES - 1] = { .page_tree = RADIX_TREE_INIT(GFP_ATOMIC|__GFP_NOWARN), .i_mmap_writable = ATOMIC_INIT(0), .a_ops = &swap_aops, - .backing_dev_info = &swap_backing_dev_info, } }; diff --git a/mm/truncate.c b/mm/truncate.c index f1e4d60..ddec5a5 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -112,7 +112,7 @@ void cancel_dirty_page(struct page *page, unsigned int account_size) struct address_space *mapping = page->mapping; if (mapping && mapping_cap_account_dirty(mapping)) { dec_zone_page_state(page, NR_FILE_DIRTY); - dec_bdi_stat(mapping->backing_dev_info, + dec_bdi_stat(inode_to_bdi(mapping->host), BDI_RECLAIMABLE); if (account_size) task_io_account_cancelled_write(account_size); diff --git a/mm/vmscan.c b/mm/vmscan.c index 8e645ee..224dd29 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -500,7 +500,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping, } if (mapping->a_ops->writepage == NULL) return PAGE_ACTIVATE; - if (!may_write_to_queue(mapping->backing_dev_info, sc)) + if (!may_write_to_queue(inode_to_bdi(mapping->host), sc)) return PAGE_KEEP; if (clear_page_dirty_for_io(page)) { @@ -879,7 +879,7 @@ static unsigned long shrink_page_list(struct list_head *page_list, */ mapping = page_mapping(page); if (((dirty || writeback) && mapping && - bdi_write_congested(mapping->backing_dev_info)) || + bdi_write_congested(inode_to_bdi(mapping->host))) || (writeback && PageReclaim(page))) nr_congested++; diff --git a/security/security.c b/security/security.c index 18b35c6..a0442b2 100644 --- a/security/security.c +++ b/security/security.c @@ -726,16 +726,15 @@ static inline unsigned long mmap_prot(struct file *file, unsigned long prot) return prot | PROT_EXEC; /* * ditto if it's not on noexec mount, except that on !MMU we need - * BDI_CAP_EXEC_MMAP (== VM_MAYEXEC) in this case + * NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case */ if (!(file->f_path.mnt->mnt_flags & MNT_NOEXEC)) { #ifndef CONFIG_MMU - unsigned long caps = 0; - struct address_space *mapping = file->f_mapping; - if (mapping && mapping->backing_dev_info) - caps = mapping->backing_dev_info->capabilities; - if (!(caps & BDI_CAP_EXEC_MAP)) - return prot; + if (file->f_op->mmap_capabilities) { + unsigned caps = file->f_op->mmap_capabilities(file); + if (!(caps & NOMMU_MAP_EXEC)) + return prot; + } #endif return prot | PROT_EXEC; } |
