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author | 2018-06-16 16:32:04 +0900 | |
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committer | 2018-06-16 16:32:04 +0900 | |
commit | 35773c93817c5f2df264d013978e7551056a063a (patch) | |
tree | 5ca02a3f3c680091d5b1019b27ba23b5323a038a /fs/proc/generic.c | |
parent | Merge branch 'work.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/v... (diff) | |
parent | afs: Optimise callback breaking by not repeating volume lookup (diff) | |
download | linux-35773c93817c5f2df264d013978e7551056a063a.tar.gz linux-35773c93817c5f2df264d013978e7551056a063a.tar.bz2 linux-35773c93817c5f2df264d013978e7551056a063a.zip |
Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull AFS updates from Al Viro:
"Assorted AFS stuff - ended up in vfs.git since most of that consists
of David's AFS-related followups to Christoph's procfs series"
* 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
afs: Optimise callback breaking by not repeating volume lookup
afs: Display manually added cells in dynamic root mount
afs: Enable IPv6 DNS lookups
afs: Show all of a server's addresses in /proc/fs/afs/servers
afs: Handle CONFIG_PROC_FS=n
proc: Make inline name size calculation automatic
afs: Implement network namespacing
afs: Mark afs_net::ws_cell as __rcu and set using rcu functions
afs: Fix a Sparse warning in xdr_decode_AFSFetchStatus()
proc: Add a way to make network proc files writable
afs: Rearrange fs/afs/proc.c to remove remaining predeclarations.
afs: Rearrange fs/afs/proc.c to move the show routines up
afs: Rearrange fs/afs/proc.c by moving fops and open functions down
afs: Move /proc management functions to the end of the file
Diffstat (limited to 'fs/proc/generic.c')
-rw-r--r-- | fs/proc/generic.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c index 7b4d9714f248..6ac1c92997ea 100644 --- a/fs/proc/generic.c +++ b/fs/proc/generic.c @@ -409,7 +409,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, if (!ent) goto out; - if (qstr.len + 1 <= sizeof(ent->inline_name)) { + if (qstr.len + 1 <= SIZEOF_PDE_INLINE_NAME) { ent->name = ent->inline_name; } else { ent->name = kmalloc(qstr.len + 1, GFP_KERNEL); @@ -740,3 +740,27 @@ void *PDE_DATA(const struct inode *inode) return __PDE_DATA(inode); } EXPORT_SYMBOL(PDE_DATA); + +/* + * Pull a user buffer into memory and pass it to the file's write handler if + * one is supplied. The ->write() method is permitted to modify the + * kernel-side buffer. + */ +ssize_t proc_simple_write(struct file *f, const char __user *ubuf, size_t size, + loff_t *_pos) +{ + struct proc_dir_entry *pde = PDE(file_inode(f)); + char *buf; + int ret; + + if (!pde->write) + return -EACCES; + if (size == 0 || size > PAGE_SIZE - 1) + return -EINVAL; + buf = memdup_user_nul(ubuf, size); + if (IS_ERR(buf)) + return PTR_ERR(buf); + ret = pde->write(f, buf, size); + kfree(buf); + return ret == 0 ? size : ret; +} |