diff options
| -rw-r--r-- | Documentation/feature-removal-schedule.txt | 20 | ||||
| -rw-r--r-- | Documentation/filesystems/Locking | 2 | ||||
| -rw-r--r-- | fs/gfs2/ops_file.c | 2 | ||||
| -rw-r--r-- | fs/gfs2/ops_vm.c | 47 | ||||
| -rw-r--r-- | fs/ncpfs/mmap.c | 38 | ||||
| -rw-r--r-- | fs/ocfs2/mmap.c | 30 | ||||
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_file.c | 14 | ||||
| -rw-r--r-- | include/linux/mm.h | 84 | ||||
| -rw-r--r-- | ipc/shm.c | 5 | ||||
| -rw-r--r-- | mm/filemap.c | 249 | ||||
| -rw-r--r-- | mm/filemap_xip.c | 37 | ||||
| -rw-r--r-- | mm/fremap.c | 85 | ||||
| -rw-r--r-- | mm/hugetlb.c | 7 | ||||
| -rw-r--r-- | mm/memory.c | 109 | ||||
| -rw-r--r-- | mm/nommu.c | 4 | ||||
| -rw-r--r-- | mm/shmem.c | 29 |
16 files changed, 238 insertions, 524 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index 716568a..cff63be 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -135,26 +135,8 @@ Who: Greg Kroah-Hartman <gregkh@suse.de> --------------------------- -What: filemap_nopage, filemap_populate -When: April 2007 -Why: These legacy interfaces no longer have any callers in the kernel and - any functionality provided can be provided with filemap_fault. The - removal schedule is short because they are a big maintainence burden - and have some bugs. -Who: Nick Piggin <npiggin@suse.de> - ---------------------------- - -What: vm_ops.populate, install_page -When: April 2007 -Why: These legacy interfaces no longer have any callers in the kernel and - any functionality provided can be provided with vm_ops.fault. -Who: Nick Piggin <npiggin@suse.de> - ---------------------------- - What: vm_ops.nopage -When: February 2008, provided in-kernel callers have been converted +When: Soon, provided in-kernel callers have been converted Why: This interface is replaced by vm_ops.fault, but it has been around forever, is used by a lot of drivers, and doesn't cost much to maintain. diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 91ec4b4..f0f8258 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -510,7 +510,7 @@ More details about quota locking can be found in fs/dquot.c. prototypes: void (*open)(struct vm_area_struct*); void (*close)(struct vm_area_struct*); - struct page *(*fault)(struct vm_area_struct*, struct fault_data *); + int (*fault)(struct vm_area_struct*, struct vm_fault *); struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *); int (*page_mkwrite)(struct vm_area_struct *, struct page *); diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c index 581ac11..1a5e8e8 100644 --- a/fs/gfs2/ops_file.c +++ b/fs/gfs2/ops_file.c @@ -364,8 +364,6 @@ static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) else vma->vm_ops = &gfs2_vm_ops_private; - vma->vm_flags |= VM_CAN_INVALIDATE|VM_CAN_NONLINEAR; - gfs2_glock_dq_uninit(&i_gh); return error; diff --git a/fs/gfs2/ops_vm.c b/fs/gfs2/ops_vm.c index e9fe6eb..dc287d2 100644 --- a/fs/gfs2/ops_vm.c +++ b/fs/gfs2/ops_vm.c @@ -27,13 +27,12 @@ #include "trans.h" #include "util.h" -static struct page *gfs2_private_fault(struct vm_area_struct *vma, - struct fault_data *fdata) +static int gfs2_private_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct gfs2_inode *ip = GFS2_I(vma->vm_file->f_mapping->host); set_bit(GIF_PAGED, &ip->i_flags); - return filemap_fault(vma, fdata); + return filemap_fault(vma, vmf); } static int alloc_page_backing(struct gfs2_inode *ip, struct page *page) @@ -104,55 +103,55 @@ out: return error; } -static struct page *gfs2_sharewrite_fault(struct vm_area_struct *vma, - struct fault_data *fdata) +static int gfs2_sharewrite_fault(struct vm_area_struct *vma, + struct vm_fault *vmf) { struct file *file = vma->vm_file; struct gfs2_file *gf = file->private_data; struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); struct gfs2_holder i_gh; - struct page *result = NULL; int alloc_required; int error; + int ret = VM_FAULT_MINOR; error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); if (error) - return NULL; + goto out; set_bit(GIF_PAGED, &ip->i_flags); set_bit(GIF_SW_PAGED, &ip->i_flags); error = gfs2_write_alloc_required(ip, - (u64)fdata->pgoff << PAGE_CACHE_SHIFT, + (u64)vmf->pgoff << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE, &alloc_required); if (error) { - fdata->type = VM_FAULT_OOM; /* XXX: are these right? */ - goto out; + ret = VM_FAULT_OOM; /* XXX: are these right? */ + goto out_unlock; } set_bit(GFF_EXLOCK, &gf->f_flags); - result = filemap_fault(vma, fdata); + ret = filemap_fault(vma, vmf); clear_bit(GFF_EXLOCK, &gf->f_flags); - if (!result) - goto out; + if (ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE)) + goto out_unlock; if (alloc_required) { - error = alloc_page_backing(ip, result); + /* XXX: do we need to drop page lock around alloc_page_backing?*/ + error = alloc_page_backing(ip, vmf->page); if (error) { - if (vma->vm_flags & VM_CAN_INVALIDATE) - unlock_page(result); - page_cache_release(result); - fdata->type = VM_FAULT_OOM; - result = NULL; - goto out; + if (ret & FAULT_RET_LOCKED) + unlock_page(vmf->page); + page_cache_release(vmf->page); + ret = VM_FAULT_OOM; + goto out_unlock; } - set_page_dirty(result); + set_page_dirty(vmf->page); } -out: +out_unlock: gfs2_glock_dq_uninit(&i_gh); - - return result; +out: + return ret; } struct vm_operations_struct gfs2_vm_ops_private = { diff --git a/fs/ncpfs/mmap.c b/fs/ncpfs/mmap.c index af48b79..a94473d 100644 --- a/fs/ncpfs/mmap.c +++ b/fs/ncpfs/mmap.c @@ -24,33 +24,35 @@ /* * Fill in the supplied page for mmap + * XXX: how are we excluding truncate/invalidate here? Maybe need to lock + * page? */ -static struct page* ncp_file_mmap_fault(struct vm_area_struct *area, - struct fault_data *fdata) +static int ncp_file_mmap_fault(struct vm_area_struct *area, + struct vm_fault *vmf) { struct file *file = area->vm_file; struct dentry *dentry = file->f_path.dentry; struct inode *inode = dentry->d_inode; - struct page* page; char *pg_addr; unsigned int already_read; unsigned int count; int bufsize; - int pos; + int pos; /* XXX: loff_t ? */ - page = alloc_page(GFP_HIGHUSER); /* ncpfs has nothing against high pages - as long as recvmsg and memset works on it */ - if (!page) { - fdata->type = VM_FAULT_OOM; - return NULL; - } - pg_addr = kmap(page); - pos = fdata->pgoff << PAGE_SHIFT; + /* + * ncpfs has nothing against high pages as long + * as recvmsg and memset works on it + */ + vmf->page = alloc_page(GFP_HIGHUSER); + if (!vmf->page) + return VM_FAULT_OOM; + pg_addr = kmap(vmf->page); + pos = vmf->pgoff << PAGE_SHIFT; count = PAGE_SIZE; - if (fdata->address + PAGE_SIZE > area->vm_end) { + if ((unsigned long)vmf->virtual_address + PAGE_SIZE > area->vm_end) { WARN_ON(1); /* shouldn't happen? */ - count = area->vm_end - fdata->address; + count = area->vm_end - (unsigned long)vmf->virtual_address; } /* what we can read in one go */ bufsize = NCP_SERVER(inode)->buffer_size; @@ -85,17 +87,16 @@ static struct page* ncp_file_mmap_fault(struct vm_area_struct *area, if (already_read < PAGE_SIZE) memset(pg_addr + already_read, 0, PAGE_SIZE - already_read); - flush_dcache_page(page); - kunmap(page); + flush_dcache_page(vmf->page); + kunmap(vmf->page); /* * If I understand ncp_read_kernel() properly, the above always * fetches from the network, here the analogue of disk. * -- wli */ - fdata->type = VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); - return page; + return VM_FAULT_MAJOR; } static struct vm_operations_struct ncp_file_mmap = @@ -124,7 +125,6 @@ int ncp_mmap(struct file *file, struct vm_area_struct *vma) return -EFBIG; vma->vm_ops = &ncp_file_mmap; - vma->vm_flags |= VM_CAN_INVALIDATE; file_accessed(file); return 0; } diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c index cd75508..ee64749 100644 --- a/fs/ocfs2/mmap.c +++ b/fs/ocfs2/mmap.c @@ -60,30 +60,28 @@ static inline int ocfs2_vm_op_unblock_sigs(sigset_t *oldset) return sigprocmask(SIG_SETMASK, oldset, NULL); } -static struct page *ocfs2_fault(struct vm_area_struct *area, - struct fault_data *fdata) +static int ocfs2_fault(struct vm_area_struct *area, struct vm_fault *vmf) { - struct page *page = NULL; sigset_t blocked, oldset; - int ret; + int error, ret; - mlog_entry("(area=%p, page offset=%lu)\n", area, fdata->pgoff); + mlog_entry("(area=%p, page offset=%lu)\n", area, vmf->pgoff); - ret = ocfs2_vm_op_block_sigs(&blocked, &oldset); - if (ret < 0) { - fdata->type = VM_FAULT_SIGBUS; - mlog_errno(ret); + error = ocfs2_vm_op_block_sigs(&blocked, &oldset); + if (error < 0) { + mlog_errno(error); + ret = VM_FAULT_SIGBUS; goto out; } - page = filemap_fault(area, fdata); + ret = filemap_fault(area, vmf); - ret = ocfs2_vm_op_unblock_sigs(&oldset); - if (ret < 0) - mlog_errno(ret); + error = ocfs2_vm_op_unblock_sigs(&oldset); + if (error < 0) + mlog_errno(error); out: - mlog_exit_ptr(page); - return page; + mlog_exit_ptr(vmf->page); + return ret; } static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh, @@ -225,7 +223,7 @@ int ocfs2_mmap(struct file *file, struct vm_area_struct *vma) ocfs2_meta_unlock(file->f_dentry->d_inode, lock_level); out: vma->vm_ops = &ocfs2_file_vm_ops; - vma->vm_flags |= VM_CAN_INVALIDATE | VM_CAN_NONLINEAR; + vma->vm_flags |= VM_CAN_NONLINEAR; return 0; } diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c index f12e80a..2d4be2f 100644 --- a/fs/xfs/linux-2.6/xfs_file.c +++ b/fs/xfs/linux-2.6/xfs_file.c @@ -212,20 +212,18 @@ xfs_file_fsync( } #ifdef CONFIG_XFS_DMAPI -STATIC struct page * +STATIC int xfs_vm_fault( struct vm_area_struct *vma, - struct fault_data *fdata) + struct vm_fault *vmf) { struct inode *inode = vma->vm_file->f_path.dentry->d_inode; bhv_vnode_t *vp = vn_from_inode(inode); ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI); - if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), vma, 0)) { - fdata->type = VM_FAULT_SIGBUS; - return NULL; - } - return filemap_fault(vma, fdata); + if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), vma, 0)) + return VM_FAULT_SIGBUS; + return filemap_fault(vma, vmf); } #endif /* CONFIG_XFS_DMAPI */ @@ -311,7 +309,7 @@ xfs_file_mmap( struct vm_area_struct *vma) { vma->vm_ops = &xfs_file_vm_ops; - vma->vm_flags |= VM_CAN_INVALIDATE | VM_CAN_NONLINEAR; + vma->vm_flags |= VM_CAN_NONLINEAR; #ifdef CONFIG_XFS_DMAPI if (vn_from_inode(filp->f_path.dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI) diff --git a/include/linux/mm.h b/include/linux/mm.h index f28a1b3..ff0b884 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -168,12 +168,7 @@ extern unsigned int kobjsize(const void *objp); #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ -#define VM_CAN_INVALIDATE 0x08000000 /* The mapping may be invalidated, - * eg. truncate or invalidate_inode_*. - * In this case, do_no_page must - * return with the page locked. - */ -#define VM_CAN_NONLINEAR 0x10000000 /* Has ->fault & does nonlinear pages */ +#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ #ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS @@ -197,24 +192,44 @@ extern unsigned int kobjsize(const void *objp); */ extern pgprot_t protection_map[16]; -#define FAULT_FLAG_WRITE 0x01 -#define FAULT_FLAG_NONLINEAR 0x02 +#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ +#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ + + +#define FAULT_RET_NOPAGE 0x0100 /* ->fault did not return a page. This + * can be used if the handler installs + * their own pte. + */ +#define FAULT_RET_LOCKED 0x0200 /* ->fault locked the page, caller must + * unlock after installing the mapping. + * This is used by pagecache in + * particular, where the page lock is + * used to synchronise against truncate + * and invalidate. Mutually exclusive + * with FAULT_RET_NOPAGE. + */ /* - * fault_data is filled in the the pagefault handler and passed to the - * vma's ->fault function. That function is responsible for filling in - * 'type', which is the type of fault if a page is returned, or the type - * of error if NULL is returned. + * vm_fault is filled by the the pagefault handler and passed to the vma's + * ->fault function. The vma's ->fault is responsible for returning the + * VM_FAULT_xxx type which occupies the lowest byte of the return code, ORed + * with FAULT_RET_ flags that occupy the next byte and give details about + * how the fault was handled. * - * pgoff should be used in favour of address, if possible. If pgoff is - * used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get - * nonlinear mapping support. + * pgoff should be used in favour of virtual_address, if possible. If pgoff + * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear + * mapping support. */ -struct fault_data { - unsigned long address; - pgoff_t pgoff; - unsigned int flags; - int type; +struct vm_fault { + unsigned int flags; /* FAULT_FLAG_xxx flags */ + pgoff_t pgoff; /* Logical page offset based on vma */ + void __user *virtual_address; /* Faulting virtual address */ + + struct page *page; /* ->fault handlers should return a + * page here, unless FAULT_RET_NOPAGE + * is set (which is also implied by + * VM_FAULT_OOM or SIGBUS). + */ }; /* @@ -225,15 +240,11 @@ struct fault_data { struct vm_operations_struct { void (*open)(struct vm_area_struct * area); void (*close)(struct vm_area_struct * area); - struct page *(*fault)(struct vm_area_struct *vma, - struct fault_data *fdata); + int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); struct page *(*nopage)(struct vm_area_struct *area, unsigned long address, int *type); unsigned long (*nopfn)(struct vm_area_struct *area, unsigned long address); - int (*populate)(struct vm_area_struct *area, unsigned long address, - unsigned long len, pgprot_t prot, unsigned long pgoff, - int nonblock); /* notification that a previously read-only page is about to become * writable, if an error is returned it will cause a SIGBUS */ @@ -700,8 +711,14 @@ static inline int page_mapped(struct page *page) * Used to decide whether a process gets delivered SIGBUS or * just gets major/minor fault counters bumped up. */ -#define VM_FAULT_OOM 0x00 -#define VM_FAULT_SIGBUS 0x01 + +/* + * VM_FAULT_ERROR is set for the error cases, to make some tests simpler. + */ +#define VM_FAULT_ERROR 0x20 + +#define VM_FAULT_OOM (0x00 | VM_FAULT_ERROR) +#define VM_FAULT_SIGBUS (0x01 | VM_FAULT_ERROR) #define VM_FAULT_MINOR 0x02 #define VM_FAULT_MAJOR 0x03 @@ -711,6 +728,11 @@ static inline int page_mapped(struct page *page) */ #define VM_FAULT_WRITE 0x10 +/* + * Mask of VM_FAULT_ flags + */ +#define VM_FAULT_MASK 0xff + #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) extern void show_free_areas(void); @@ -793,8 +815,6 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, extern int vmtruncate(struct inode * inode, loff_t offset); extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end); -extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot); -extern int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot); #ifdef CONFIG_MMU extern int __handle_mm_fault(struct mm_struct *mm,struct vm_area_struct *vma, @@ -1135,11 +1155,7 @@ extern void truncate_inode_pages_range(struct address_space *, loff_t lstart, loff_t lend); /* generic vm_area_ops exported for stackable file systems */ -extern struct page *filemap_fault(struct vm_area_struct *, struct fault_data *); -extern struct page * __deprecated_for_modules -filemap_nopage(struct vm_area_struct *, unsigned long, int *); -extern int __deprecated_for_modules filemap_populate(struct vm_area_struct *, - unsigned long, unsigned long, pgprot_t, unsigned long, int); +extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); /* mm/page-writeback.c */ int write_one_page(struct page *page, int wait); @@ -224,13 +224,12 @@ static void shm_close(struct vm_area_struct *vma) mutex_unlock(&shm_ids(ns).mutex); } -static struct page *shm_fault(struct vm_area_struct *vma, - struct fault_data *fdata) +static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); - return sfd->vm_ops->fault(vma, fdata); + return sfd->vm_ops->fault(vma, vmf); } #ifdef CONFIG_NUMA diff --git a/mm/filemap.c b/mm/filemap.c index 26b992d..0876cc5 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1302,8 +1302,8 @@ static int fastcall page_cache_read(struct file * file, unsigned long offset) /** * filemap_fault - read in file data for page fault handling - * @vma: user vma (not used) - * @fdata: the applicable fault_data + * @vma: vma in which the fault was taken + * @vmf: struct vm_fault containing details of the fault * * filemap_fault() is invoked via the vma operations vector for a * mapped memory region to read in file data during a page fault. @@ -1312,7 +1312,7 @@ static int fastcall page_cache_read(struct file * file, unsigned long offset) * it in the page cache, and handles the special cases reasonably without * having a lot of duplicated code. */ -struct page *filemap_fault(struct vm_area_struct *vma, struct fault_data *fdata) +int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { int error; struct file *file = vma->vm_file; @@ -1322,13 +1322,12 @@ struct page *filemap_fault(struct vm_area_struct *vma, struct fault_data *fdata) struct page *page; unsigned long size; int did_readaround = 0; + int ret; - fdata->type = VM_FAULT_MINOR; - - BUG_ON(!(vma->vm_flags & VM_CAN_INVALIDATE)); + ret = VM_FAULT_MINOR; size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (fdata->pgoff >= size) + if (vmf->pgoff >= size) goto outside_data_content; /* If we don't want any read-ahead, don't bother */ @@ -1342,18 +1341,18 @@ struct page *filemap_fault(struct vm_area_struct *vma, struct fault_data *fdata) * For sequential accesses, we use the generic readahead logic. */ if (VM_SequentialReadHint(vma)) - page_cache_readahead(mapping, ra, file, fdata->pgoff, 1); + page_cache_readahead(mapping, ra, file, vmf->pgoff, 1); /* * Do we have something in the page cache already? */ retry_find: - page = find_lock_page(mapping, fdata->pgoff); + page = find_lock_page(mapping, vmf->pgoff); if (!page) { unsigned long ra_pages; if (VM_SequentialReadHint(vma)) { - handle_ra_miss(mapping, ra, fdata->pgoff); + handle_ra_miss(mapping, ra, vmf->pgoff); goto no_cached_page; } ra->mmap_miss++; @@ -1370,7 +1369,7 @@ retry_find: * check did_readaround, as this is an inner loop. */ if (!did_readaround) { - fdata->type = VM_FAULT_MAJOR; + ret = VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); } did_readaround = 1; @@ -1378,11 +1377,11 @@ retry_find: if (ra_pages) { pgoff_t start = 0; - if (fdata->pgoff > ra_pages / 2) - start = fdata->pgoff - ra_pages / 2; + if (vmf->pgoff > ra_pages / 2) + start = vmf->pgoff - ra_pages / 2; do_page_cache_readahead(mapping, file, start, ra_pages); } - page = find_lock_page(mapping, fdata->pgoff); + page = find_lock_page(mapping, vmf->pgoff); if (!page) goto no_cached_page; } @@ -1399,7 +1398,7 @@ retry_find: /* Must recheck i_size under page lock */ size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (unlikely(fdata->pgoff >= size)) { + if (unlikely(vmf->pgoff >= size)) { unlock_page(page); goto outside_data_content; } @@ -1408,24 +1407,24 @@ retry_find: * Found the page and have a reference on it. */ mark_page_accessed(page); - return page; + vmf->page = page; + return ret | FAULT_RET_LOCKED; outside_data_content: /* * An external ptracer can access pages that normally aren't * accessible.. */ - if (vma->vm_mm == current->mm) { - fdata->type = VM_FAULT_SIGBUS; - return NULL; - } + if (vma->vm_mm == current->mm) + return VM_FAULT_SIGBUS; + /* Fall through to the non-read-ahead case */ no_cached_page: /* * We're only likely to ever get here if MADV_RANDOM is in * effect. */ - error = page_cache_read(file, fdata->pgoff); + error = page_cache_read(file, vmf->pgoff); /* * The page we want has now been added to the page cache. @@ -1441,15 +1440,13 @@ no_cached_page: * to schedule I/O. */ if (error == -ENOMEM) - fdata->type = VM_FAULT_OOM; - else - fdata->type = VM_FAULT_SIGBUS; - return NULL; + return VM_FAULT_OOM; + return VM_FAULT_SIGBUS; page_not_uptodate: /* IO error path */ if (!did_readaround) { - fdata->type = VM_FAULT_MAJOR; + ret = VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); } @@ -1468,206 +1465,10 @@ page_not_uptodate: /* Things didn't work out. Return zero to tell the mm layer so. */ shrink_readahead_size_eio(file, ra); - fdata->type = VM_FAULT_SIGBUS; - return NULL; + return VM_FAULT_SIGBUS; } EXPORT_SYMBOL(filemap_fault); -/* - * filemap_nopage and filemap_populate are legacy exports that are not used - * in tree. Scheduled for removal. - */ -struct page *filemap_nopage(struct vm_area_struct *area, - unsigned long address, int *type) -{ - struct page *page; - struct fault_data fdata; - fdata.address = address; - fdata.pgoff = ((address - area->vm_start) >> PAGE_CACHE_SHIFT) - + area->vm_pgoff; - fdata.flags = 0; - - page = filemap_fault(area, &fdata); - if (type) - *type = fdata.type; - - return page; -} -EXPORT_SYMBOL(filemap_nopage); - -static struct page * filemap_getpage(struct file *file, unsigned long pgoff, - int nonblock) -{ - struct address_space *mapping = file->f_mapping; - struct page *page; - int error; - - /* - * Do we have something in the page cache already? - */ -retry_find: - page = find_get_page(mapping, pgoff); - if (!page) { - if (nonblock) - return NULL; - goto no_cached_page; - } - - /* - * Ok, found a page in the page cache, now we need to check - * that it's up-to-date. - */ - if (!PageUptodate(page)) { - if (nonblock) { - page_cache_release(page); - return NULL; - } - goto page_not_uptodate; - } - -success: - /* - * Found the page and have a reference on it. - */ - mark_page_accessed(page); - return page; - -no_cached_page: - error = page_cache_read(file, pgoff); - - /* - * The page we want has now been added to the page cache. - * In the unlikely event that someone removed it in the - * meantime, we'll just come back here and read it again. - */ - if (error >= 0) - goto retry_find; - - /* - * An error return from page_cache_read can result if the - * system is low on memory, or a problem occurs while trying - * to schedule I/O. - */ - return NULL; - -page_not_uptodate: - lock_page(page); - - /* Did it get truncated while we waited for it? */ - if (!page->mapping) { - unlock_page(page); - goto err; - } - - /* Did somebody else get it up-to-date? */ - if (PageUptodate(page)) { - unlock_page(page); - goto success; - } - - error = mapping->a_ops->readpage(file, page); - if (!error) { - wait_on_page_locked(page); - if (PageUptodate(page)) - goto success; - } else if (error == AOP_TRUNCATED_PAGE) { - page_cache_release(page); - goto retry_find; - } - - /* - * Umm, take care of errors if the page isn't up-to-date. - * Try to re-read it _once_. We do this synchronously, - * because there really aren't any performance issues here - * and we need to check for errors. - */ - lock_page(page); - - /* Somebody truncated the page on us? */ - if (!page->mapping) { - unlock_page(page); - goto err; - } - /* Somebody else successfully read it in? */ - if (PageUptodate(page)) { - unlock_page(page); - goto success; - } - - ClearPageError(page); - error = mapping->a_ops->readpage(file, page); - if (!error) { - wait_on_page_locked(page); - if (PageUptodate(page)) - goto success; - } else if (error == AOP_TRUNCATED_PAGE) { - page_cache_release(page); - goto retry_find; - } - - /* - * Things didn't work out. Return zero to tell the - * mm layer so, possibly freeing the page cache page first. - */ -err: - page_cache_release(page); - - return NULL; -} - -int filemap_populate(struct vm_area_struct *vma, unsigned long addr, - unsigned long len, pgprot_t prot, unsigned long pgoff, - int nonblock) -{ - struct file *file = vma->vm_file; - struct address_space *mapping = file->f_mapping; - struct inode *inode = mapping->host; - unsigned long size; - struct mm_struct *mm = vma->vm_mm; - struct page *page; - int err; - - if (!nonblock) - force_page_cache_readahead(mapping, vma->vm_file, - pgoff, len >> PAGE_CACHE_SHIFT); - -repeat: - size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (pgoff + (len >> PAGE_CACHE_SHIFT) > size) - return -EINVAL; - - page = filemap_getpage(file, pgoff, nonblock); - - /* XXX: This is wrong, a filesystem I/O error may have happened. Fix that as - * done in shmem_populate calling shmem_getpage */ - if (!page && !nonblock) - return -ENOMEM; - - if (page) { - err = install_page(mm, vma, addr, page, prot); - if (err) { - page_cache_release(page); - return err; - } - } else if (vma->vm_flags & VM_NONLINEAR) { - /* No page was found just because we can't read it in now (being - * here implies nonblock != 0), but the page may exist, so set - * the PTE to fault it in later. */ - err = install_file_pte(mm, vma, addr, pgoff, prot); - if (err) - return err; - } - - len -= PAGE_SIZE; - addr += PAGE_SIZE; - pgoff++; - if (len) - goto repeat; - - return 0; -} -EXPORT_SYMBOL(filemap_populate); - struct vm_operations_struct generic_file_vm_ops = { .fault = filemap_fault, }; @@ -1682,7 +1483,7 @@ int generic_file_mmap(struct file * file, struct vm_area_struct * vma) return -ENOEXEC; file_accessed(file); vma->vm_ops = &generic_file_vm_ops; - vma->vm_flags |= VM_CAN_INVALIDATE | VM_CAN_NONLINEAR; + vma->vm_flags |= VM_CAN_NONLINEAR; return 0; } diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c index 82f4b8e..847d5d7 100644 --- a/mm/filemap_xip.c +++ b/mm/filemap_xip.c @@ -210,8 +210,7 @@ __xip_unmap (struct address_space * mapping, * * This function is derived from filemap_fault, but used for execute in place */ -static struct page *xip_file_fault(struct vm_area_struct *area, - struct fault_data *fdata) +static int xip_file_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct file *file = area->vm_file; struct address_space *mapping = file->f_mapping; @@ -222,19 +221,15 @@ static struct page *xip_file_fault(struct vm_area_struct *area, /* XXX: are VM_FAULT_ codes OK? */ size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (fdata->pgoff >= size) { - fdata->type = VM_FAULT_SIGBUS; - return NULL; - } + if (vmf->pgoff >= size) + return VM_FAULT_SIGBUS; page = mapping->a_ops->get_xip_page(mapping, - fdata->pgoff*(PAGE_SIZE/512), 0); + vmf->pgoff*(PAGE_SIZE/512), 0); if (!IS_ERR(page)) goto out; - if (PTR_ERR(page) != -ENODATA) { - fdata->type = VM_FAULT_OOM; - return NULL; - } + if (PTR_ERR(page) != -ENODATA) + return VM_FAULT_OOM; /* sparse block */ if ((area->vm_flags & (VM_WRITE | VM_MAYWRITE)) && @@ -242,26 +237,22 @@ static struct page *xip_file_fault(struct vm_area_struct *area, (!(mapping->host->i_sb->s_flags & MS_RDONLY))) { /* maybe shared writable, allocate new block */ page = mapping->a_ops->get_xip_page(mapping, - fdata->pgoff*(PAGE_SIZE/512), 1); - if (IS_ERR(page)) { - fdata->type = VM_FAULT_SIGBUS; - return NULL; - } + vmf->pgoff*(PAGE_SIZE/512), 1); + if (IS_ERR(page)) + return VM_FAULT_SIGBUS; /* unmap page at pgoff from all other vmas */ - __xip_unmap(mapping, fdata->pgoff); + __xip_unmap(mapping, vmf->pgoff); } else { /* not shared and writable, use xip_sparse_page() */ page = xip_sparse_page(); - if (!page) { - fdata->type = VM_FAULT_OOM; - return NULL; - } + if (!page) + return VM_FAULT_OOM; } out: - fdata->type = VM_FAULT_MINOR; page_cache_get(page); - return page; + vmf->page = page; + return VM_FAULT_MINOR; } static struct vm_operations_struct xip_file_vm_ops = { diff --git a/mm/fremap.c b/mm/fremap.c index 01e51f0..5f50d73 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -20,13 +20,14 @@ #include <asm/cacheflush.h> #include <asm/tlbflush.h> -static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma, +static void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { pte_t pte = *ptep; - struct page *page = NULL; if (pte_present(pte)) { + struct page *page; + flush_cache_page(vma, addr, pte_pfn(pte)); pte = ptep_clear_flush(vma, addr, ptep); page = vm_normal_page(vma, addr, pte); @@ -35,68 +36,21 @@ static int zap_pte(struct mm_struct *mm, struct vm_area_struct *vma, set_page_dirty(page); page_remove_rmap(page, vma); page_cache_release(page); + update_hiwater_rss(mm); + dec_mm_counter(mm, file_rss); } } else { if (!pte_file(pte)) free_swap_and_cache(pte_to_swp_entry(pte)); pte_clear_not_present_full(mm, addr, ptep, 0); } - return !!page; } /* - * Install a file page to a given virtual memory address, release any - * previously existing mapping. - */ -int install_page(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long addr, struct page *page, pgprot_t prot) -{ - struct inode *inode; - pgoff_t size; - int err = -ENOMEM; - pte_t *pte; - pte_t pte_val; - spinlock_t *ptl; - - pte = get_locked_pte(mm, addr, &ptl); - if (!pte) - goto out; - - /* - * This page may have been truncated. Tell the - * caller about it. - */ - err = -EINVAL; - inode = vma->vm_file->f_mapping->host; - size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - if (!page->mapping || page->index >= size) - goto unlock; - err = -ENOMEM; - if (page_mapcount(page) > INT_MAX/2) - goto unlock; - - if (pte_none(*pte) || !zap_pte(mm, vma, addr, pte)) - inc_mm_counter(mm, file_rss); - - flush_icache_page(vma, page); - pte_val = mk_pte(page, prot); - set_pte_at(mm, addr, pte, pte_val); - page_add_file_rmap(page); - update_mmu_cache(vma, addr, pte_val); - lazy_mmu_prot_update(pte_val); - err = 0; -unlock: - pte_unmap_unlock(pte, ptl); -out: - return err; -} -EXPORT_SYMBOL(install_page); - -/* * Install a file pte to a given virtual memory address, release any * previously existing mapping. */ -int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, +static int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long pgoff, pgprot_t prot) { int err = -ENOMEM; @@ -107,10 +61,8 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, if (!pte) goto out; - if (!pte_none(*pte) && zap_pte(mm, vma, addr, pte)) { - update_hiwater_rss(mm); - dec_mm_counter(mm, file_rss); - } + if (!pte_none(*pte)) + zap_pte(mm, vma, addr, pte); set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff)); /* @@ -208,8 +160,7 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size, if (vma->vm_private_data && !(vma->vm_flags & VM_NONLINEAR)) goto out; - if ((!vma->vm_ops || !vma->vm_ops->populate) && - !(vma->vm_flags & VM_CAN_NONLINEAR)) + if (!vma->vm_flags & VM_CAN_NONLINEAR) goto out; if (end <= start || start < vma->vm_start || end > vma->vm_end) @@ -239,18 +190,14 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size, spin_unlock(&mapping->i_mmap_lock); } - if (vma->vm_flags & VM_CAN_NONLINEAR) { - err = populate_range(mm, vma, start, size, pgoff); - if (!err && !(flags & MAP_NONBLOCK)) { - if (unlikely(has_write_lock)) { - downgrade_write(&mm->mmap_sem); - has_write_lock = 0; - } - make_pages_present(start, start+size); + err = populate_range(mm, vma, start, size, pgoff); + if (!err && !(flags & MAP_NONBLOCK)) { + if (unlikely(has_write_lock)) { + downgrade_write(&mm->mmap_sem); + has_write_lock = 0; } - } else - err = vma->vm_ops->populate(vma, start, size, vma->vm_page_prot, - pgoff, flags & MAP_NONBLOCK); + make_pages_present(start, start+size); + } /* * We can't clear VM_NONLINEAR because we'd have to do diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 6912bbf..aaa7c1a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -316,15 +316,14 @@ unsigned long hugetlb_total_pages(void) * hugegpage VMA. do_page_fault() is supposed to trap this, so BUG is we get * this far. */ -static struct page *hugetlb_nopage(struct vm_area_struct *vma, - unsigned long address, int *unused) +static int hugetlb_vm_op_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { BUG(); - return NULL; + return 0; } struct vm_operations_struct hugetlb_vm_ops = { - .nopage = hugetlb_nopage, + .fault = hugetlb_vm_op_fault, }; static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, diff --git a/mm/memory.c b/mm/memory.c index 7abd389..23c8704 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1834,10 +1834,10 @@ static int unmap_mapping_range_vma(struct vm_area_struct *vma, /* * files that support invalidating or truncating portions of the - * file from under mmaped areas must set the VM_CAN_INVALIDATE flag, and - * have their .nopage function return the page locked. + * file from under mmaped areas must have their ->fault function + * return a locked page (and FAULT_RET_LOCKED code). This provides + * synchronisation against concurrent unmapping here. */ - BUG_ON(!(vma->vm_flags & VM_CAN_INVALIDATE)); again: restart_addr = vma->vm_truncate_count; @@ -2306,63 +2306,62 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, pgoff_t pgoff, unsigned int flags, pte_t orig_pte) { spinlock_t *ptl; - struct page *page, *faulted_page; + struct page *page; pte_t entry; int anon = 0; struct page *dirty_page = NULL; - struct fault_data fdata; + struct vm_fault vmf; + int ret; - fdata.address = address & PAGE_MASK; - fdata.pgoff = pgoff; - fdata.flags = flags; + vmf.virtual_address = (void __user *)(address & PAGE_MASK); + vmf.pgoff = pgoff; + vmf.flags = flags; + vmf.page = NULL; pte_unmap(page_table); BUG_ON(vma->vm_flags & VM_PFNMAP); if (likely(vma->vm_ops->fault)) { - fdata.type = -1; - faulted_page = vma->vm_ops->fault(vma, &fdata); - WARN_ON(fdata.type == -1); - if (unlikely(!faulted_page)) - return fdata.type; + ret = vma->vm_ops->fault(vma, &vmf); + if (unlikely(ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE))) + return (ret & VM_FAULT_MASK); } else { /* Legacy ->nopage path */ - fdata.type = VM_FAULT_MINOR; - faulted_page = vma->vm_ops->nopage(vma, address & PAGE_MASK, - &fdata.type); + ret = VM_FAULT_MINOR; + vmf.page = vma->vm_ops->nopage(vma, address & PAGE_MASK, &ret); /* no page was available -- either SIGBUS or OOM */ - if (unlikely(faulted_page == NOPAGE_SIGBUS)) + if (unlikely(vmf.page == NOPAGE_SIGBUS)) return VM_FAULT_SIGBUS; - else if (unlikely(faulted_page == NOPAGE_OOM)) + else if (unlikely(vmf.page == NOPAGE_OOM)) return VM_FAULT_OOM; } /* - * For consistency in subsequent calls, make the faulted_page always + * For consistency in subsequent calls, make the faulted page always * locked. */ - if (unlikely(!(vma->vm_flags & VM_CAN_INVALIDATE))) - lock_page(faulted_page); + if (unlikely(!(ret & FAULT_RET_LOCKED))) + lock_page(vmf.page); else - BUG_ON(!PageLocked(faulted_page)); + VM_BUG_ON(!PageLocked(vmf.page)); /* * Should we do an early C-O-W break? */ - page = faulted_page; + page = vmf.page; if (flags & FAULT_FLAG_WRITE) { if (!(vma->vm_flags & VM_SHARED)) { anon = 1; if (unlikely(anon_vma_prepare(vma))) { - fdata.type = VM_FAULT_OOM; + ret = VM_FAULT_OOM; goto out; } page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); if (!page) { - fdata.type = VM_FAULT_OOM; + ret = VM_FAULT_OOM; goto out; } - copy_user_highpage(page, faulted_page, address, vma); + copy_user_highpage(page, vmf.page, address, vma); } else { /* * If the page will be shareable, see if the backing @@ -2372,11 +2371,23 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, if (vma->vm_ops->page_mkwrite) { unlock_page(page); if (vma->vm_ops->page_mkwrite(vma, page) < 0) { - fdata.type = VM_FAULT_SIGBUS; - anon = 1; /* no anon but release faulted_page */ + ret = VM_FAULT_SIGBUS; + anon = 1; /* no anon but release vmf.page */ goto out_unlocked; } lock_page(page); + /* + * XXX: this is not quite right (racy vs + * invalidate) to unlock and relock the page + * like this, however a better fix requires + * reworking page_mkwrite locking API, which + * is better done later. + */ + if (!page->mapping) { + ret = VM_FAULT_MINOR; + anon = 1; /* no anon but release vmf.page */ + goto out; + } } } @@ -2427,16 +2438,16 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, pte_unmap_unlock(page_table, ptl); out: - unlock_page(faulted_page); + unlock_page(vmf.page); out_unlocked: if (anon) - page_cache_release(faulted_page); + page_cache_release(vmf.page); else if (dirty_page) { set_page_dirty_balance(dirty_page); put_page(dirty_page); } - return fdata.type; + return (ret & VM_FAULT_MASK); } static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma, @@ -2447,18 +2458,10 @@ static int do_linear_fault(struct mm_struct *mm, struct vm_area_struct *vma, - vma->vm_start) >> PAGE_CACHE_SHIFT) + vma->vm_pgoff; unsigned int flags = (write_access ? FAULT_FLAG_WRITE : 0); - return __do_fault(mm, vma, address, page_table, pmd, pgoff, flags, orig_pte); + return __do_fault(mm, vma, address, page_table, pmd, pgoff, + flags, orig_pte); } -static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long address, pte_t *page_table, pmd_t *pmd, - int write_access, pgoff_t pgoff, pte_t orig_pte) -{ - unsigned int flags = FAULT_FLAG_NONLINEAR | - (write_access ? FAULT_FLAG_WRITE : 0); - - return __do_fault(mm, vma, address, page_table, pmd, pgoff, flags, orig_pte); -} /* * do_no_pfn() tries to create a new page mapping for a page without @@ -2519,17 +2522,19 @@ static noinline int do_no_pfn(struct mm_struct *mm, struct vm_area_struct *vma, * but allow concurrent faults), and pte mapped but not yet locked. * We return with mmap_sem still held, but pte unmapped and unlocked. */ -static int do_file_page(struct mm_struct *mm, struct vm_area_struct *vma, +static int do_nonlinear_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, pte_t *page_table, pmd_t *pmd, int write_access, pte_t orig_pte) { + unsigned int flags = FAULT_FLAG_NONLINEAR | + (write_access ? FAULT_FLAG_WRITE : 0); pgoff_t pgoff; - int err; if (!pte_unmap_same(mm, pmd, page_table, orig_pte)) return VM_FAULT_MINOR; - if (unlikely(!(vma->vm_flags & VM_NONLINEAR))) { + if (unlikely(!(vma->vm_flags & VM_NONLINEAR) || + !(vma->vm_flags & VM_CAN_NONLINEAR))) { /* * Page table corrupted: show pte and kill process. */ @@ -2539,18 +2544,8 @@ static int do_file_page(struct mm_struct *mm, struct vm_area_struct *vma, pgoff = pte_to_pgoff(orig_pte); - if (vma->vm_ops && vma->vm_ops->fault) - return do_nonlinear_fault(mm, vma, address, page_table, pmd, - write_access, pgoff, orig_pte); - - /* We can then assume vm->vm_ops && vma->vm_ops->populate */ - err = vma->vm_ops->populate(vma, address & PAGE_MASK, PAGE_SIZE, - vma->vm_page_prot, pgoff, 0); - if (err == -ENOMEM) - return VM_FAULT_OOM; - if (err) - return VM_FAULT_SIGBUS; - return VM_FAULT_MAJOR; + return __do_fault(mm, vma, address, page_table, pmd, pgoff, + flags, orig_pte); } /* @@ -2588,7 +2583,7 @@ static inline int handle_pte_fault(struct mm_struct *mm, pte, pmd, write_access); } if (pte_file(entry)) - return do_file_page(mm, vma, address, + return do_nonlinear_fault(mm, vma, address, pte, pmd, write_access, entry); return do_swap_page(mm, vma, address, pte, pmd, write_access, entry); @@ -1341,10 +1341,10 @@ int in_gate_area_no_task(unsigned long addr) return 0; } -struct page *filemap_fault(struct vm_area_struct *vma, struct fault_data *fdata) +int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { BUG(); - return NULL; + return 0; } /* @@ -1309,29 +1309,21 @@ failed: return error; } -static struct page *shmem_fault(struct vm_area_struct *vma, - struct fault_data *fdata) +static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) { struct inode *inode = vma->vm_file->f_path.dentry->d_inode; - struct page *page = NULL; int error; + int ret; - BUG_ON(!(vma->vm_flags & VM_CAN_INVALIDATE)); + if (((loff_t)vmf->pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode)) + return VM_FAULT_SIGBUS; - if (((loff_t)fdata->pgoff << PAGE_CACHE_SHIFT) >= i_size_read(inode)) { - fdata->type = VM_FAULT_SIGBUS; - return NULL; - } - - error = shmem_getpage(inode, fdata->pgoff, &page, - SGP_FAULT, &fdata->type); - if (error) { - fdata->type = ((error == -ENOMEM)?VM_FAULT_OOM:VM_FAULT_SIGBUS); - return NULL; - } + error = shmem_getpage(inode, vmf->pgoff, &vmf->page, SGP_FAULT, &ret); + if (error) + return ((error == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS); - mark_page_accessed(page); - return page; + mark_page_accessed(vmf->page); + return ret | FAULT_RET_LOCKED; } #ifdef CONFIG_NUMA @@ -1378,7 +1370,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma) { file_accessed(file); vma->vm_ops = &shmem_vm_ops; - vma->vm_flags |= VM_CAN_INVALIDATE | VM_CAN_NONLINEAR; + vma->vm_flags |= VM_CAN_NONLINEAR; return 0; } @@ -2560,6 +2552,5 @@ int shmem_zero_setup(struct vm_area_struct *vma) fput(vma->vm_file); vma->vm_file = file; vma->vm_ops = &shmem_vm_ops; - vma->vm_flags |= VM_CAN_INVALIDATE; return 0; } |
