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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

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Pull fuse bugfixes from Miklos Szeredi:
 "This contains two more fixes by Maxim for writeback/truncate races and
  fixes for RCU walk in fuse_dentry_revalidate()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: no RCU mode in fuse_access()
  fuse: readdirplus: fix RCU walk
  fuse: don't check_submounts_and_drop() in RCU walk
  fuse: fix fallocate vs. ftruncate race
  fuse: wait for writeback in fuse_file_fallocate()
This commit is contained in:
Linus Torvalds 2013-10-04 09:06:13 -07:00
commit 15c83d26e1
3 changed files with 32 additions and 13 deletions
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20
fs/fuse/dir.c
View File

@ -182,6 +182,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
struct inode *inode;
struct dentry *parent;
struct fuse_conn *fc;
struct fuse_inode *fi;
int ret;
inode = ACCESS_ONCE(entry->d_inode);
@ -228,7 +229,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
if (!err && !outarg.nodeid)
err = -ENOENT;
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
goto invalid;
@ -246,8 +247,11 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
attr_version);
fuse_change_entry_timeout(entry, &outarg);
} else if (inode) {
fc = get_fuse_conn(inode);
if (fc->readdirplus_auto) {
fi = get_fuse_inode(inode);
if (flags & LOOKUP_RCU) {
if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
return -ECHILD;
} else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
parent = dget_parent(entry);
fuse_advise_use_readdirplus(parent->d_inode);
dput(parent);
@ -259,7 +263,8 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
invalid:
ret = 0;
if (check_submounts_and_drop(entry) != 0)
if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0)
ret = 1;
goto out;
}
@ -1063,6 +1068,8 @@ static int fuse_access(struct inode *inode, int mask)
struct fuse_access_in inarg;
int err;
BUG_ON(mask & MAY_NOT_BLOCK);
if (fc->no_access)
return 0;
@ -1150,9 +1157,6 @@ static int fuse_permission(struct inode *inode, int mask)
noticed immediately, only after the attribute
timeout has expired */
} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
err = fuse_access(inode, mask);
} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
if (!(inode->i_mode & S_IXUGO)) {
@ -1291,6 +1295,8 @@ static int fuse_direntplus_link(struct file *file,
}
found:
if (fc->readdirplus_auto)
set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
fuse_change_entry_timeout(dentry, o);
err = 0;

23
fs/fuse/file.c
View File

@ -2467,6 +2467,7 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
{
struct fuse_file *ff = file->private_data;
struct inode *inode = file->f_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = ff->fc;
struct fuse_req *req;
struct fuse_fallocate_in inarg = {
@ -2484,10 +2485,20 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
if (lock_inode) {
mutex_lock(&inode->i_mutex);
if (mode & FALLOC_FL_PUNCH_HOLE)
fuse_set_nowrite(inode);
if (mode & FALLOC_FL_PUNCH_HOLE) {
loff_t endbyte = offset + length - 1;
err = filemap_write_and_wait_range(inode->i_mapping,
offset, endbyte);
if (err)
goto out;
fuse_sync_writes(inode);
}
}
if (!(mode & FALLOC_FL_KEEP_SIZE))
set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
req = fuse_get_req_nopages(fc);
if (IS_ERR(req)) {
err = PTR_ERR(req);
@ -2520,11 +2531,11 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
fuse_invalidate_attr(inode);
out:
if (lock_inode) {
if (mode & FALLOC_FL_PUNCH_HOLE)
fuse_release_nowrite(inode);
if (!(mode & FALLOC_FL_KEEP_SIZE))
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
if (lock_inode)
mutex_unlock(&inode->i_mutex);
}
return err;
}

2
fs/fuse/fuse_i.h
View File

@ -115,6 +115,8 @@ struct fuse_inode {
enum {
/** Advise readdirplus */
FUSE_I_ADVISE_RDPLUS,
/** Initialized with readdirplus */
FUSE_I_INIT_RDPLUS,
/** An operation changing file size is in progress */
FUSE_I_SIZE_UNSTABLE,
};