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-rw-r--r--Documentation/filesystems/vfat.txt5
-rw-r--r--fs/fat/cache.c6
-rw-r--r--fs/fat/dir.c2
-rw-r--r--fs/fat/fat.h7
-rw-r--r--fs/fat/fatent.c4
-rw-r--r--fs/fat/file.c184
-rw-r--r--fs/fat/inode.c28
-rw-r--r--fs/fat/misc.c22
-rw-r--r--fs/fat/namei_msdos.c2
-rw-r--r--fs/fat/namei_vfat.c2
10 files changed, 152 insertions, 110 deletions
diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index 5147be5..b58b84b 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -132,6 +132,11 @@ rodir -- FAT has the ATTR_RO (read-only) attribute. On Windows,
If you want to use ATTR_RO as read-only flag even for
the directory, set this option.
+errors=panic|continue|remount-ro
+ -- specify FAT behavior on critical errors: panic, continue
+ without doing anything or remount the partition in
+ read-only mode (default behavior).
+
<bool>: 0,1,yes,no,true,false
TODO
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index b426022..923990e 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -241,7 +241,7 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
while (*fclus < cluster) {
/* prevent the infinite loop of cluster chain */
if (*fclus > limit) {
- fat_fs_panic(sb, "%s: detected the cluster chain loop"
+ fat_fs_error(sb, "%s: detected the cluster chain loop"
" (i_pos %lld)", __func__,
MSDOS_I(inode)->i_pos);
nr = -EIO;
@@ -252,7 +252,7 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
if (nr < 0)
goto out;
else if (nr == FAT_ENT_FREE) {
- fat_fs_panic(sb, "%s: invalid cluster chain"
+ fat_fs_error(sb, "%s: invalid cluster chain"
" (i_pos %lld)", __func__,
MSDOS_I(inode)->i_pos);
nr = -EIO;
@@ -285,7 +285,7 @@ static int fat_bmap_cluster(struct inode *inode, int cluster)
if (ret < 0)
return ret;
else if (ret == FAT_ENT_EOF) {
- fat_fs_panic(sb, "%s: request beyond EOF (i_pos %lld)",
+ fat_fs_error(sb, "%s: request beyond EOF (i_pos %lld)",
__func__, MSDOS_I(inode)->i_pos);
return -EIO;
}
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index f350029..3b8e71b 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -1334,7 +1334,7 @@ found:
goto error_remove;
}
if (dir->i_size & (sbi->cluster_size - 1)) {
- fat_fs_panic(sb, "Odd directory size");
+ fat_fs_error(sb, "Odd directory size");
dir->i_size = (dir->i_size + sbi->cluster_size - 1)
& ~((loff_t)sbi->cluster_size - 1);
}
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index e4d8852..adb0e72 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -17,6 +17,10 @@
#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
+#define FAT_ERRORS_CONT 1 /* ignore error and continue */
+#define FAT_ERRORS_PANIC 2 /* panic on error */
+#define FAT_ERRORS_RO 3 /* remount r/o on error */
+
struct fat_mount_options {
uid_t fs_uid;
gid_t fs_gid;
@@ -26,6 +30,7 @@ struct fat_mount_options {
char *iocharset; /* Charset used for filename input/display */
unsigned short shortname; /* flags for shortname display/create rule */
unsigned char name_check; /* r = relaxed, n = normal, s = strict */
+ unsigned char errors; /* On error: continue, panic, remount-ro */
unsigned short allow_utime;/* permission for setting the [am]time */
unsigned quiet:1, /* set = fake successful chmods and chowns */
showexec:1, /* set = only set x bit for com/exe/bat */
@@ -316,7 +321,7 @@ extern int fat_fill_super(struct super_block *sb, void *data, int silent,
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2);
/* fat/misc.c */
-extern void fat_fs_panic(struct super_block *s, const char *fmt, ...)
+extern void fat_fs_error(struct super_block *s, const char *fmt, ...)
__attribute__ ((format (printf, 2, 3))) __cold;
extern void fat_clusters_flush(struct super_block *sb);
extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 618f530..a810377 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -348,7 +348,7 @@ int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry)
if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {
fatent_brelse(fatent);
- fat_fs_panic(sb, "invalid access to FAT (entry 0x%08x)", entry);
+ fat_fs_error(sb, "invalid access to FAT (entry 0x%08x)", entry);
return -EIO;
}
@@ -560,7 +560,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
err = cluster;
goto error;
} else if (cluster == FAT_ENT_FREE) {
- fat_fs_panic(sb, "%s: deleting FAT entry beyond EOF",
+ fat_fs_error(sb, "%s: deleting FAT entry beyond EOF",
__func__);
err = -EIO;
goto error;
diff --git a/fs/fat/file.c b/fs/fat/file.c
index e955a56..b28ea64 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -18,106 +18,112 @@
#include <linux/security.h>
#include "fat.h"
-int fat_generic_ioctl(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
+static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
{
+ u32 attr;
+
+ mutex_lock(&inode->i_mutex);
+ attr = fat_make_attrs(inode);
+ mutex_unlock(&inode->i_mutex);
+
+ return put_user(attr, user_attr);
+}
+
+static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
- u32 __user *user_attr = (u32 __user *)arg;
+ int is_dir = S_ISDIR(inode->i_mode);
+ u32 attr, oldattr;
+ struct iattr ia;
+ int err;
- switch (cmd) {
- case FAT_IOCTL_GET_ATTRIBUTES:
- {
- u32 attr;
+ err = get_user(attr, user_attr);
+ if (err)
+ goto out;
- mutex_lock(&inode->i_mutex);
- attr = fat_make_attrs(inode);
- mutex_unlock(&inode->i_mutex);
+ mutex_lock(&inode->i_mutex);
+ err = mnt_want_write(file->f_path.mnt);
+ if (err)
+ goto out_unlock_inode;
- return put_user(attr, user_attr);
+ /*
+ * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
+ * prevents the user from turning us into a VFAT
+ * longname entry. Also, we obviously can't set
+ * any of the NTFS attributes in the high 24 bits.
+ */
+ attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
+ /* Merge in ATTR_VOLUME and ATTR_DIR */
+ attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
+ (is_dir ? ATTR_DIR : 0);
+ oldattr = fat_make_attrs(inode);
+
+ /* Equivalent to a chmod() */
+ ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+ ia.ia_ctime = current_fs_time(inode->i_sb);
+ if (is_dir)
+ ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
+ else {
+ ia.ia_mode = fat_make_mode(sbi, attr,
+ S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
}
- case FAT_IOCTL_SET_ATTRIBUTES:
- {
- u32 attr, oldattr;
- int err, is_dir = S_ISDIR(inode->i_mode);
- struct iattr ia;
- err = get_user(attr, user_attr);
- if (err)
- return err;
+ /* The root directory has no attributes */
+ if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
+ err = -EINVAL;
+ goto out_drop_write;
+ }
- mutex_lock(&inode->i_mutex);
-
- err = mnt_want_write(filp->f_path.mnt);
- if (err)
- goto up_no_drop_write;
-
- /*
- * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
- * prevents the user from turning us into a VFAT
- * longname entry. Also, we obviously can't set
- * any of the NTFS attributes in the high 24 bits.
- */
- attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
- /* Merge in ATTR_VOLUME and ATTR_DIR */
- attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
- (is_dir ? ATTR_DIR : 0);
- oldattr = fat_make_attrs(inode);
-
- /* Equivalent to a chmod() */
- ia.ia_valid = ATTR_MODE | ATTR_CTIME;
- ia.ia_ctime = current_fs_time(inode->i_sb);
- if (is_dir)
- ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
- else {
- ia.ia_mode = fat_make_mode(sbi, attr,
- S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
- }
+ if (sbi->options.sys_immutable &&
+ ((attr | oldattr) & ATTR_SYS) &&
+ !capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto out_drop_write;
+ }
- /* The root directory has no attributes */
- if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
- err = -EINVAL;
- goto up;
- }
+ /*
+ * The security check is questionable... We single
+ * out the RO attribute for checking by the security
+ * module, just because it maps to a file mode.
+ */
+ err = security_inode_setattr(file->f_path.dentry, &ia);
+ if (err)
+ goto out_drop_write;
- if (sbi->options.sys_immutable) {
- if ((attr | oldattr) & ATTR_SYS) {
- if (!capable(CAP_LINUX_IMMUTABLE)) {
- err = -EPERM;
- goto up;
- }
- }
- }
+ /* This MUST be done before doing anything irreversible... */
+ err = fat_setattr(file->f_path.dentry, &ia);
+ if (err)
+ goto out_drop_write;
+
+ fsnotify_change(file->f_path.dentry, ia.ia_valid);
+ if (sbi->options.sys_immutable) {
+ if (attr & ATTR_SYS)
+ inode->i_flags |= S_IMMUTABLE;
+ else
+ inode->i_flags &= S_IMMUTABLE;
+ }
- /*
- * The security check is questionable... We single
- * out the RO attribute for checking by the security
- * module, just because it maps to a file mode.
- */
- err = security_inode_setattr(filp->f_path.dentry, &ia);
- if (err)
- goto up;
-
- /* This MUST be done before doing anything irreversible... */
- err = fat_setattr(filp->f_path.dentry, &ia);
- if (err)
- goto up;
-
- fsnotify_change(filp->f_path.dentry, ia.ia_valid);
- if (sbi->options.sys_immutable) {
- if (attr & ATTR_SYS)
- inode->i_flags |= S_IMMUTABLE;
- else
- inode->i_flags &= S_IMMUTABLE;
- }
+ fat_save_attrs(inode, attr);
+ mark_inode_dirty(inode);
+out_drop_write:
+ mnt_drop_write(file->f_path.mnt);
+out_unlock_inode:
+ mutex_unlock(&inode->i_mutex);
+out:
+ return err;
+}
- fat_save_attrs(inode, attr);
- mark_inode_dirty(inode);
-up:
- mnt_drop_write(filp->f_path.mnt);
-up_no_drop_write:
- mutex_unlock(&inode->i_mutex);
- return err;
- }
+int fat_generic_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ u32 __user *user_attr = (u32 __user *)arg;
+
+ switch (cmd) {
+ case FAT_IOCTL_GET_ATTRIBUTES:
+ return fat_ioctl_get_attributes(inode, user_attr);
+ case FAT_IOCTL_SET_ATTRIBUTES:
+ return fat_ioctl_set_attributes(filp, user_attr);
default:
return -ENOTTY; /* Inappropriate ioctl for device */
}
@@ -225,7 +231,7 @@ static int fat_free(struct inode *inode, int skip)
fatent_brelse(&fatent);
return 0;
} else if (ret == FAT_ENT_FREE) {
- fat_fs_panic(sb,
+ fat_fs_error(sb,
"%s: invalid cluster chain (i_pos %lld)",
__func__, MSDOS_I(inode)->i_pos);
ret = -EIO;
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 51a5ecf..304b411 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -76,7 +76,7 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
return 0;
if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
- fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)",
+ fat_fs_error(sb, "corrupted file size (i_pos %lld, %lld)",
MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
return -EIO;
}
@@ -856,6 +856,12 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_puts(m, ",flush");
if (opts->tz_utc)
seq_puts(m, ",tz=UTC");
+ if (opts->errors == FAT_ERRORS_CONT)
+ seq_puts(m, ",errors=continue");
+ else if (opts->errors == FAT_ERRORS_PANIC)
+ seq_puts(m, ",errors=panic");
+ else
+ seq_puts(m, ",errors=remount-ro");
return 0;
}
@@ -868,7 +874,8 @@ enum {
Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
- Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err,
+ Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
+ Opt_err_panic, Opt_err_ro, Opt_err,
};
static const match_table_t fat_tokens = {
@@ -891,6 +898,11 @@ static const match_table_t fat_tokens = {
{Opt_showexec, "showexec"},
{Opt_debug, "debug"},
{Opt_immutable, "sys_immutable"},
+ {Opt_flush, "flush"},
+ {Opt_tz_utc, "tz=UTC"},
+ {Opt_err_cont, "errors=continue"},
+ {Opt_err_panic, "errors=panic"},
+ {Opt_err_ro, "errors=remount-ro"},
{Opt_obsolate, "conv=binary"},
{Opt_obsolate, "conv=text"},
{Opt_obsolate, "conv=auto"},
@@ -902,8 +914,6 @@ static const match_table_t fat_tokens = {
{Opt_obsolate, "cvf_format=%20s"},
{Opt_obsolate, "cvf_options=%100s"},
{Opt_obsolate, "posix"},
- {Opt_flush, "flush"},
- {Opt_tz_utc, "tz=UTC"},
{Opt_err, NULL},
};
static const match_table_t msdos_tokens = {
@@ -973,6 +983,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
opts->numtail = 1;
opts->usefree = opts->nocase = 0;
opts->tz_utc = 0;
+ opts->errors = FAT_ERRORS_RO;
*debug = 0;
if (!options)
@@ -1065,6 +1076,15 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
case Opt_tz_utc:
opts->tz_utc = 1;
break;
+ case Opt_err_cont:
+ opts->errors = FAT_ERRORS_CONT;
+ break;
+ case Opt_err_panic:
+ opts->errors = FAT_ERRORS_PANIC;
+ break;
+ case Opt_err_ro:
+ opts->errors = FAT_ERRORS_RO;
+ break;
/* msdos specific */
case Opt_dots:
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index ac39ebc..a6c2047 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -12,14 +12,19 @@
#include "fat.h"
/*
- * fat_fs_panic reports a severe file system problem and sets the file system
- * read-only. The file system can be made writable again by remounting it.
+ * fat_fs_error reports a file system problem that might indicate fa data
+ * corruption/inconsistency. Depending on 'errors' mount option the
+ * panic() is called, or error message is printed FAT and nothing is done,
+ * or filesystem is remounted read-only (default behavior).
+ * In case the file system is remounted read-only, it can be made writable
+ * again by remounting it.
*/
-void fat_fs_panic(struct super_block *s, const char *fmt, ...)
+void fat_fs_error(struct super_block *s, const char *fmt, ...)
{
+ struct fat_mount_options *opts = &MSDOS_SB(s)->options;
va_list args;
- printk(KERN_ERR "FAT: Filesystem panic (dev %s)\n", s->s_id);
+ printk(KERN_ERR "FAT: Filesystem error (dev %s)\n", s->s_id);
printk(KERN_ERR " ");
va_start(args, fmt);
@@ -27,13 +32,14 @@ void fat_fs_panic(struct super_block *s, const char *fmt, ...)
va_end(args);
printk("\n");
- if (!(s->s_flags & MS_RDONLY)) {
+ if (opts->errors == FAT_ERRORS_PANIC)
+ panic(" FAT fs panic from previous error\n");
+ else if (opts->errors == FAT_ERRORS_RO && !(s->s_flags & MS_RDONLY)) {
s->s_flags |= MS_RDONLY;
printk(KERN_ERR " File system has been set read-only\n");
}
}
-
-EXPORT_SYMBOL_GPL(fat_fs_panic);
+EXPORT_SYMBOL_GPL(fat_fs_error);
/* Flushes the number of free clusters on FAT32 */
/* XXX: Need to write one per FSINFO block. Currently only writes 1 */
@@ -124,7 +130,7 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
mark_inode_dirty(inode);
}
if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
- fat_fs_panic(sb, "clusters badly computed (%d != %llu)",
+ fat_fs_error(sb, "clusters badly computed (%d != %llu)",
new_fclus,
(llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
fat_cache_inval_inode(inode);
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index 20f5228..82f8873 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -608,7 +608,7 @@ error_inode:
sinfo.bh = NULL;
}
if (corrupt < 0) {
- fat_fs_panic(new_dir->i_sb,
+ fat_fs_error(new_dir->i_sb,
"%s: Filesystem corrupted (i_pos %lld)",
__func__, sinfo.i_pos);
}
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index b50ecbe..8d6fdcf 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -1030,7 +1030,7 @@ error_inode:
sinfo.bh = NULL;
}
if (corrupt < 0) {
- fat_fs_panic(new_dir->i_sb,
+ fat_fs_error(new_dir->i_sb,
"%s: Filesystem corrupted (i_pos %lld)",
__func__, sinfo.i_pos);
}
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