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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-04-28 13:16:27 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 19:58:47 +0400
commit606e423e43bac0c2f7b85b682eb1ddd2a634586e (patch)
tree86e7bc56e7e70cf1403aec7fd58d854490b1478f /fs/fat/fatent.c
parent1ae43f826b6cb951fc5b0f9c92372a8d5b63c7f9 (diff)
downloadlinux-606e423e43bac0c2f7b85b682eb1ddd2a634586e.tar.xz
fat: Update free_clusters even if it is untrusted
Currently, free_clusters is not updated until it is trusted, because Windows doesn't update it correctly. But if user is using FAT driver of Linux, it updates free_clusters correctly. Instead, this updates it even if it's untrusted, so if free_clustes is correct, now keep correct value. Signed-off-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/fatent.c')
-rw-r--r--fs/fat/fatent.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 5fb366992b73..c7c8ab2209e1 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -450,7 +450,8 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
BUG_ON(nr_cluster > (MAX_BUF_PER_PAGE / 2)); /* fixed limit */
lock_fat(sbi);
- if (sbi->free_clusters != -1 && sbi->free_clusters < nr_cluster) {
+ if (sbi->free_clusters != -1 && sbi->free_clus_valid &&
+ sbi->free_clusters < nr_cluster) {
unlock_fat(sbi);
return -ENOSPC;
}
@@ -504,6 +505,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
/* Couldn't allocate the free entries */
sbi->free_clusters = 0;
+ sbi->free_clus_valid = 1;
sb->s_dirt = 1;
err = -ENOSPC;
@@ -615,7 +617,7 @@ int fat_count_free_clusters(struct super_block *sb)
int err = 0, free;
lock_fat(sbi);
- if (sbi->free_clusters != -1)
+ if (sbi->free_clusters != -1 && sbi->free_clus_valid)
goto out;
reada_blocks = FAT_READA_SIZE >> sb->s_blocksize_bits;
@@ -643,6 +645,7 @@ int fat_count_free_clusters(struct super_block *sb)
} while (fat_ent_next(sbi, &fatent));
}
sbi->free_clusters = free;
+ sbi->free_clus_valid = 1;
sb->s_dirt = 1;
fatent_brelse(&fatent);
out: