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authorNamjae Jeon <namjae.jeon@samsung.com>2013-04-30 03:21:12 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 05:28:41 +0400
commit8fceb4e0171f6bf64db756c65b2ce5f15aed8b4d (patch)
treed5dcc788292169e2bf4b9cd96111d2c2c46777fb /fs/fat/inode.c
parentea3983ace6b79c96e6ab3d3837e2eaf81ab881e2 (diff)
downloadlinux-8fceb4e0171f6bf64db756c65b2ce5f15aed8b4d.tar.xz
fat (exportfs): rebuild inode if ilookup() fails
If the cache lookups fail,use the i_pos value to find the directory entry of the inode and rebuild the inode.Since this involves accessing the FAT media, do this only if the nostale_ro nfs mount option is specified. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Ravishankar N <ravi.n1@samsung.com> Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/inode.c')
-rw-r--r--fs/fat/inode.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 27f49f4fa0d3..971ba7d549da 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -443,12 +443,25 @@ static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
return 0;
}
+static inline void fat_lock_build_inode(struct msdos_sb_info *sbi)
+{
+ if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
+ mutex_lock(&sbi->nfs_build_inode_lock);
+}
+
+static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi)
+{
+ if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
+ mutex_unlock(&sbi->nfs_build_inode_lock);
+}
+
struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos)
{
struct inode *inode;
int err;
+ fat_lock_build_inode(MSDOS_SB(sb));
inode = fat_iget(sb, i_pos);
if (inode)
goto out;
@@ -468,6 +481,7 @@ struct inode *fat_build_inode(struct super_block *sb,
fat_attach(inode, i_pos);
insert_inode_hash(inode);
out:
+ fat_unlock_build_inode(MSDOS_SB(sb));
return inode;
}
@@ -1247,6 +1261,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
sb->s_magic = MSDOS_SUPER_MAGIC;
sb->s_op = &fat_sops;
sb->s_export_op = &fat_export_ops;
+ mutex_init(&sbi->nfs_build_inode_lock);
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);