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|
$NetBSD: patch-9084,v 1.1 2014/11/18 14:38:15 manu Exp $
From 23b7ead5de0f21abdcf5440a4a43dcf3a42c3822 Mon Sep 17 00:00:00 2001
From: Emmanuel Dreyfus <manu@netbsd.org>
Date: Mon, 10 Nov 2014 10:01:00 +0100
Subject: [PATCH] telldir()/seekdir() portability fixes
POSIX says that an offset obtained from telldir() can only be used
on the same DIR *. Linux is abls to reuse the offset accross
closedir()/opendir() for a given directory, but this is not portable
and such a behavior should be fixed.
An incomplete fix for the posix xlator was merged in
http://review.gluster.org/8933
This change set completes it.
- Perform the same fix index xlator.
- Use appropriate casts and variable types so that 32 bit signed
offsets obtained by telldir() do not get clobbered when copied into
64 bit signed types.
- modify afr-self-heald.c so that it does not use anonymous fd,
since this will cause closedir()/opendir() between each
syncop_readdir(). On failure we fallback to anonymous fs
only for Linux so that we can cope with updated client vs not
updated brick.
- Avoid sending an EINVAL when the client request for the EOF offset.
Here we fix an error in previous fix for posix xlator: since we
fill each directory entry with the offset of the next entry, we
must consider as EOF the offset of the last entry, and not the
value of telldir() after we read it.
This is a backport of I59fb7f06a872c4f98987105792d648141c258c6a
BUG: 1138897
Change-Id: I1e9f3e4a7d780b98adf6d9f197ee2198d43ef94d
Signed-off-by: Emmanuel Dreyfus <manu@netbsd.org>
---
xlators/cluster/afr/src/afr-self-heald.c | 46 +++++++++++++++++++++++++++-----
xlators/features/index/src/index.c | 42 ++++++++++++++++++++---------
xlators/features/index/src/index.h | 1 +
xlators/storage/posix/src/posix.c | 26 +++++++++++-------
4 files changed, 87 insertions(+), 28 deletions(-)
diff --git xlators/cluster/afr/src/afr-self-heald.c xlators/cluster/afr/src/afr-self-heald.c
index 10e1996..6ce52aa 100644
--- xlators/cluster/afr/src/afr-self-heald.c
+++ xlators/cluster/afr/src/afr-self-heald.c
@@ -276,6 +276,8 @@ afr_shd_index_opendir (xlator_t *this, int child)
#ifdef GF_LINUX_HOST_OS
fd_unref (fd);
fd = fd_anonymous (inode);
+ if (!fd)
+ goto out;
#else /* GF_LINUX_HOST_OS */
gf_log(this->name, GF_LOG_ERROR,
"opendir of %s for %s failed: %s",
@@ -429,7 +431,7 @@ afr_shd_index_sweep (struct subvol_healer *healer)
fd_t *fd = NULL;
xlator_t *subvol = NULL;
afr_private_t *priv = NULL;
- off_t offset = 0;
+ uint64_t offset = 0;
gf_dirent_t entries;
gf_dirent_t *entry = NULL;
uuid_t gfid;
@@ -503,11 +505,12 @@ afr_shd_index_sweep (struct subvol_healer *healer)
int
afr_shd_full_sweep (struct subvol_healer *healer, inode_t *inode)
{
+ loc_t loc = {0, };
fd_t *fd = NULL;
xlator_t *this = NULL;
xlator_t *subvol = NULL;
afr_private_t *priv = NULL;
- off_t offset = 0;
+ uint64_t offset = 0;
gf_dirent_t entries;
gf_dirent_t *entry = NULL;
int ret = 0;
@@ -516,9 +519,38 @@ afr_shd_full_sweep (struct subvol_healer *healer, inode_t *inode)
priv = this->private;
subvol = priv->children[healer->subvol];
- fd = fd_anonymous (inode);
- if (!fd)
- return -errno;
+ uuid_copy (loc.gfid, inode->gfid);
+ loc.inode = inode_ref(inode);
+
+ fd = fd_create (inode, GF_CLIENT_PID_AFR_SELF_HEALD);
+ if (!fd) {
+ gf_log(this->name, GF_LOG_ERROR,
+ "fd_create of %s failed: %s",
+ uuid_utoa (loc.gfid), strerror(errno));
+ ret = -errno;
+ goto out;
+ }
+
+ ret = syncop_opendir (subvol, &loc, fd);
+ if (ret) {
+#ifdef GF_LINUX_HOST_OS /* See comment in afr_shd_index_opendir() */
+ fd_unref(fd);
+ fd = fd_anonymous (inode);
+ if (!fd) {
+ gf_log(this->name, GF_LOG_ERROR,
+ "fd_anonymous of %s failed: %s",
+ uuid_utoa (loc.gfid), strerror(errno));
+ ret = -errno;
+ goto out;
+ }
+#else /* GF_LINUX_HOST_OS */
+ gf_log(this->name, GF_LOG_ERROR,
+ "opendir of %s failed: %s",
+ uuid_utoa (loc.gfid), strerror(errno));
+ ret = -errno;
+ goto out;
+#endif /* GF_LINUX_HOST_OS */
+ }
INIT_LIST_HEAD (&entries.list);
@@ -560,6 +592,8 @@ afr_shd_full_sweep (struct subvol_healer *healer, inode_t *inode)
break;
}
+out:
+ loc_wipe (&loc);
if (fd)
fd_unref (fd);
return ret;
@@ -949,7 +983,7 @@ afr_shd_gather_index_entries (xlator_t *this, int child, dict_t *output)
fd_t *fd = NULL;
xlator_t *subvol = NULL;
afr_private_t *priv = NULL;
- off_t offset = 0;
+ uint64_t offset = 0;
gf_dirent_t entries;
gf_dirent_t *entry = NULL;
uuid_t gfid;
diff --git xlators/features/index/src/index.c xlators/features/index/src/index.c
index c342da8..50e2e0a 100644
--- xlators/features/index/src/index.c
+++ xlators/features/index/src/index.c
@@ -268,10 +268,11 @@ check_delete_stale_index_file (xlator_t *this, char *filename)
}
static int
-index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
+index_fill_readdir (fd_t *fd, index_fd_ctx_t *fctx, DIR *dir, off_t off,
size_t size, gf_dirent_t *entries)
{
off_t in_case = -1;
+ off_t last_off = 0;
size_t filled = 0;
int count = 0;
char entrybuf[sizeof(struct dirent) + 256 + 8];
@@ -286,11 +287,11 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
} else {
seekdir (dir, off);
#ifndef GF_LINUX_HOST_OS
- if (telldir(dir) != off) {
+ if ((u_long)telldir(dir) != off && off != fctx->dir_eof) {
gf_log (THIS->name, GF_LOG_ERROR,
- "seekdir(%ld) failed on dir=%p: "
+ "seekdir(0x%llx) failed on dir=%p: "
"Invalid argument (offset reused from "
- "another DIR * structure?)", (long)off, dir);
+ "another DIR * structure?)", off, dir);
errno = EINVAL;
count = -1;
goto out;
@@ -299,7 +300,7 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
}
while (filled <= size) {
- in_case = telldir (dir);
+ in_case = (u_long)telldir (dir);
if (in_case == -1) {
gf_log (THIS->name, GF_LOG_ERROR,
@@ -335,12 +336,13 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
if (this_size + filled > size) {
seekdir (dir, in_case);
#ifndef GF_LINUX_HOST_OS
- if (telldir(dir) != in_case) {
+ if ((u_long)telldir(dir) != in_case &&
+ in_case != fctx->dir_eof) {
gf_log (THIS->name, GF_LOG_ERROR,
- "seekdir(%ld) failed on dir=%p: "
+ "seekdir(0x%llx) failed on dir=%p: "
"Invalid argument (offset reused from "
"another DIR * structure?)",
- (long)in_case, dir);
+ in_case, dir);
errno = EINVAL;
count = -1;
goto out;
@@ -357,7 +359,14 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
entry->d_name, strerror (errno));
goto out;
}
- this_entry->d_off = telldir (dir);
+ /*
+ * we store the offset of next entry here, which is
+ * probably not intended, but code using syncop_readdir()
+ * (glfs-heal.c, afr-self-heald.c, pump.c) rely on it
+ * for directory read resumption.
+ */
+ last_off = (u_long)telldir(dir);
+ this_entry->d_off = last_off;
this_entry->d_ino = entry->d_ino;
list_add_tail (&this_entry->list, &entries->list);
@@ -366,9 +375,12 @@ index_fill_readdir (fd_t *fd, DIR *dir, off_t off,
count ++;
}
- if ((!readdir (dir) && (errno == 0)))
+ if ((!readdir (dir) && (errno == 0))) {
/* Indicate EOF */
errno = ENOENT;
+ /* Remember EOF offset for later detection */
+ fctx->dir_eof = last_off;
+ }
out:
return count;
}
@@ -581,6 +593,7 @@ __index_fd_ctx_get (fd_t *fd, xlator_t *this, index_fd_ctx_t **ctx)
fctx = NULL;
goto out;
}
+ fctx->dir_eof = -1;
ret = __fd_ctx_set (fd, this, (uint64_t)(long)fctx);
if (ret) {
@@ -949,7 +962,7 @@ index_readdir_wrapper (call_frame_t *frame, xlator_t *this,
goto done;
}
- count = index_fill_readdir (fd, dir, off, size, &entries);
+ count = index_fill_readdir (fd, fctx, dir, off, size, &entries);
/* pick ENOENT to indicate EOF */
op_errno = errno;
@@ -1270,8 +1283,11 @@ index_releasedir (xlator_t *this, fd_t *fd)
goto out;
fctx = (index_fd_ctx_t*) (long) ctx;
- if (fctx->dir)
- closedir (fctx->dir);
+ if (fctx->dir) {
+ ret = closedir (fctx->dir);
+ if (ret)
+ gf_log (this->name, GF_LOG_ERROR, "closedir error: %s", strerror (errno));
+ }
GF_FREE (fctx);
out:
diff --git xlators/features/index/src/index.h xlators/features/index/src/index.h
index 661dcdb..206d280 100644
--- xlators/features/index/src/index.h
+++ xlators/features/index/src/index.h
@@ -34,6 +34,7 @@ typedef struct index_inode_ctx {
typedef struct index_fd_ctx {
DIR *dir;
+ off_t dir_eof;
} index_fd_ctx_t;
typedef struct index_priv {
diff --git xlators/storage/posix/src/posix.c xlators/storage/posix/src/posix.c
index 3e3d14f..5d37c9f 100644
--- xlators/storage/posix/src/posix.c
+++ xlators/storage/posix/src/posix.c
@@ -4839,6 +4839,7 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
gf_dirent_t *entries, xlator_t *this, int32_t skip_dirs)
{
off_t in_case = -1;
+ off_t last_off = 0;
size_t filled = 0;
int count = 0;
char entrybuf[sizeof(struct dirent) + 256 + 8];
@@ -4874,11 +4875,11 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
} else {
seekdir (dir, off);
#ifndef GF_LINUX_HOST_OS
- if (telldir(dir) != (long)off && off != pfd->dir_eof) {
+ if ((u_long)telldir(dir) != off && off != pfd->dir_eof) {
gf_log (THIS->name, GF_LOG_ERROR,
- "seekdir(%ld) failed on dir=%p: "
+ "seekdir(0x%llx) failed on dir=%p: "
"Invalid argument (offset reused from "
- "another DIR * structure?)", (long)off, dir);
+ "another DIR * structure?)", off, dir);
errno = EINVAL;
count = -1;
goto out;
@@ -4887,7 +4888,7 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
}
while (filled <= size) {
- in_case = telldir (dir);
+ in_case = (u_long)telldir (dir);
if (in_case == -1) {
gf_log (THIS->name, GF_LOG_ERROR,
@@ -4947,13 +4948,13 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
if (this_size + filled > size) {
seekdir (dir, in_case);
#ifndef GF_LINUX_HOST_OS
- if (telldir(dir) != (long)in_case &&
+ if ((u_long)telldir(dir) != in_case &&
in_case != pfd->dir_eof) {
gf_log (THIS->name, GF_LOG_ERROR,
- "seekdir(%ld) failed on dir=%p: "
+ "seekdir(0x%llx) failed on dir=%p: "
"Invalid argument (offset reused from "
"another DIR * structure?)",
- (long)in_case, dir);
+ in_case, dir);
errno = EINVAL;
count = -1;
goto out;
@@ -4970,7 +4971,14 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
entry->d_name, strerror (errno));
goto out;
}
- this_entry->d_off = telldir (dir);
+ /*
+ * we store the offset of next entry here, which is
+ * probably not intended, but code using syncop_readdir()
+ * (glfs-heal.c, afr-self-heald.c, pump.c) rely on it
+ * for directory read resumption.
+ */
+ last_off = (u_long)telldir(dir);
+ this_entry->d_off = last_off;
this_entry->d_ino = entry->d_ino;
this_entry->d_type = entry->d_type;
@@ -4984,7 +4992,7 @@ posix_fill_readdir (fd_t *fd, DIR *dir, off_t off, size_t size,
/* Indicate EOF */
errno = ENOENT;
/* Remember EOF offset for later detection */
- pfd->dir_eof = telldir (dir);
+ pfd->dir_eof = (u_long)last_off;
}
out:
return count;
--
1.8.2.3
|
