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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-04-06 19:01:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:17 -0700
commitb028fcfc4cd198a6aa1ffcfb872073ccc1db3459 (patch)
treed6a89ba7cf253ab1738d5295f557b77e77ac4311 /fs/nilfs2/ioctl.c
parent85ef9cea02882baedd1e65336cf3dd292841dde3 (diff)
nilfs2: fix gc failure on volumes keeping numerous snapshots
This resolves the following failure of nilfs2 cleaner daemon: nilfs_cleanerd[20670]: cannot clean segments: No such file or directory nilfs_cleanerd[20670]: shutdown When creating thousands of snapshots, the cleaner daemon had rarely died as above due to an error returned from the kernel code. After applying the recent patch which fixed memory allocation problems in ioctl (Message-Id: <20081215.155840.105124170.ryusuke@osrg.net>), the problem gets more frequent. It turned out to be a bug of nilfs_ioctl_wrap_copy function and one of its callback routines to read out information of snapshots; if the nilfs_ioctl_wrap_copy function divided a large read request into multiple requests, the second and later requests have failed since a restart position on snapshot meta data was not properly set forward. It's a deficiency of the callback interface that cannot pass the restart position among multiple requests. This patch fixes the issue by allowing nilfs_ioctl_wrap_copy and snapshot read functions to exchange a position argument. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/ioctl.c')
-rw-r--r--fs/nilfs2/ioctl.c38
1 files changed, 23 insertions, 15 deletions
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index 5ce06a01c7e..d9e3990f958 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -37,13 +37,14 @@
static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
struct nilfs_argv *argv, int dir,
ssize_t (*dofunc)(struct the_nilfs *,
- int, int,
+ __u64 *, int,
void *, size_t, size_t))
{
void *buf;
size_t maxmembs, total, n;
ssize_t nr;
int ret, i;
+ __u64 pos, ppos;
if (argv->v_nmembs == 0)
return 0;
@@ -58,6 +59,7 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
ret = 0;
total = 0;
+ pos = argv->v_index;
for (i = 0; i < argv->v_nmembs; i += n) {
n = (argv->v_nmembs - i < maxmembs) ?
argv->v_nmembs - i : maxmembs;
@@ -68,8 +70,9 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
ret = -EFAULT;
break;
}
- nr = (*dofunc)(nilfs, argv->v_index + i, argv->v_flags, buf,
- argv->v_size, n);
+ ppos = pos;
+ nr = (*dofunc)(nilfs, &pos, argv->v_flags, buf, argv->v_size,
+ n);
if (nr < 0) {
ret = nr;
break;
@@ -82,6 +85,10 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
break;
}
total += nr;
+ if ((size_t)nr < n)
+ break;
+ if (pos == ppos)
+ pos += n;
}
argv->v_nmembs = total;
@@ -138,10 +145,10 @@ nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
}
static ssize_t
-nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
- return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, index, flags, buf,
+ return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
nmembs);
}
@@ -186,10 +193,10 @@ static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
}
static ssize_t
-nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
- return nilfs_sufile_get_suinfo(nilfs->ns_sufile, index, buf, nmembs);
+ return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
}
static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
@@ -233,7 +240,7 @@ static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
}
static ssize_t
-nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
@@ -262,7 +269,7 @@ static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
}
static ssize_t
-nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
struct inode *dat = nilfs_dat_inode(nilfs);
@@ -341,7 +348,7 @@ static int nilfs_ioctl_move_inode_block(struct inode *inode,
}
static ssize_t
-nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
struct inode *inode;
@@ -413,7 +420,7 @@ static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
}
static ssize_t
-nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, int index,
+nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
int flags, void *buf, size_t size,
size_t nmembs)
{
@@ -439,7 +446,7 @@ static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
}
static ssize_t
-nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
@@ -456,8 +463,9 @@ static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
}
static ssize_t
-nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, int index, int flags,
- void *buf, size_t size, size_t nmembs)
+nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
+ int flags, void *buf, size_t size,
+ size_t nmembs)
{
struct inode *dat = nilfs_dat_inode(nilfs);
struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
@@ -506,7 +514,7 @@ static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
}
static ssize_t
-nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, int index, int flags,
+nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);