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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2015-05-09 13:04:24 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-05-15 01:06:27 -0400 |
| commit | bc40aee053be1c2c443e812034f41e1a3cf34752 (patch) | |
| tree | b055560944e135a1f495674239ee2b9769574071 /fs/namei.c | |
| parent | namei: make unlazy_walk and terminate_walk handle nd->stack, add unlazy_link (diff) | |
| download | linux-dev-bc40aee053be1c2c443e812034f41e1a3cf34752.tar.xz linux-dev-bc40aee053be1c2c443e812034f41e1a3cf34752.zip | |
namei: don't unlazy until get_link()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/fs/namei.c b/fs/namei.c index a64df4c4aaef..47b20086e9f3 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -536,10 +536,19 @@ static void restore_nameidata(struct nameidata *old) static int __nd_alloc_stack(struct nameidata *nd) { - struct saved *p = kmalloc(MAXSYMLINKS * sizeof(struct saved), + struct saved *p; + + if (nd->flags & LOOKUP_RCU) { + p= kmalloc(MAXSYMLINKS * sizeof(struct saved), + GFP_ATOMIC); + if (unlikely(!p)) + return -ECHILD; + } else { + p= kmalloc(MAXSYMLINKS * sizeof(struct saved), GFP_KERNEL); - if (unlikely(!p)) - return -ENOMEM; + if (unlikely(!p)) + return -ENOMEM; + } memcpy(p, nd->internal, sizeof(nd->internal)); nd->stack = p; return 0; @@ -957,8 +966,10 @@ const char *get_link(struct nameidata *nd) int error; const char *res; - BUG_ON(nd->flags & LOOKUP_RCU); - + if (nd->flags & LOOKUP_RCU) { + if (unlikely(unlazy_walk(nd, NULL, 0))) + return ERR_PTR(-ECHILD); + } cond_resched(); touch_atime(&last->link); @@ -1623,17 +1634,21 @@ static int pick_link(struct nameidata *nd, struct path *link, path_to_nameidata(link, nd); return -ELOOP; } - if (nd->flags & LOOKUP_RCU) { - if (unlikely(unlazy_link(nd, link, seq))) - return -ECHILD; - } else { + if (!(nd->flags & LOOKUP_RCU)) { if (link->mnt == nd->path.mnt) mntget(link->mnt); } error = nd_alloc_stack(nd); if (unlikely(error)) { - path_put(link); - return error; + if (error == -ECHILD) { + if (unlikely(unlazy_link(nd, link, seq))) + return -ECHILD; + error = nd_alloc_stack(nd); + } + if (error) { + path_put(link); + return error; + } } last = nd->stack + nd->depth++; |