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author | Al Viro <viro@zeniv.linux.org.uk> | 2008-12-30 01:52:35 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2008-12-31 18:07:43 -0500 |
commit | 41080b5a240113328c607f22b849f653373db0ce (patch) | |
tree | aa8fd483c241140ebe73b6c71b370f4ad6a12251 /ipc/util.h | |
parent | 261bca86ed4f7f391d1938167624e78da61dcc6b (diff) |
nfsd race fixes: ext2
* make ext2_new_inode() put the inode into icache in locked state
* do not unlock until the inode is fully set up; otherwise nfsd
might pick it in half-baked state.
* make sure that ext2_new_inode() does *not* lead to two inodes with the
same inumber hashed at the same time; otherwise a bogus fhandle coming
from nfsd might race with inode creation:
nfsd: iget_locked() creates inode
nfsd: try to read from disk, block on that.
ext2_new_inode(): allocate inode with that inumber
ext2_new_inode(): insert it into icache, set it up and dirty
ext2_write_inode(): get the relevant part of inode table in cache,
set the entry for our inode (and start writing to disk)
nfsd: get CPU again, look into inode table, see nice and sane on-disk
inode, set the in-core inode from it
oops - we have two in-core inodes with the same inumber live in icache,
both used for IO. Welcome to fs corruption...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc/util.h')
0 files changed, 0 insertions, 0 deletions