From 028fec414d803117eb4b2ed12acb4dd5da65b32d Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Mon, 28 Apr 2008 02:12:25 -0700 Subject: mempolicy: support optional mode flags With the evolution of mempolicies, it is necessary to support mempolicy mode flags that specify how the policy shall behave in certain circumstances. The most immediate need for mode flag support is to suppress remapping the nodemask of a policy at the time of rebind. Both the mempolicy mode and flags are passed by the user in the 'int policy' formal of either the set_mempolicy() or mbind() syscall. A new constant, MPOL_MODE_FLAGS, represents the union of legal optional flags that may be passed as part of this int. Mempolicies that include illegal flags as part of their policy are rejected as invalid. An additional member to struct mempolicy is added to support the mode flags: struct mempolicy { ... unsigned short policy; unsigned short flags; } The splitting of the 'int' actual passed by the user is done in sys_set_mempolicy() and sys_mbind() for their respective syscalls. This is done by intersecting the actual with MPOL_MODE_FLAGS, rejecting the syscall of there are additional flags, and storing it in the new 'flags' member of struct mempolicy. The intersection of the actual with ~MPOL_MODE_FLAGS is stored in the 'policy' member of the struct and all current users of pol->policy remain unchanged. The union of the policy mode and optional mode flags is passed back to the user in get_mempolicy(). This combination of mode and flags within the same actual does not break userspace code that relies on get_mempolicy(&policy, ...) and either switch (policy) { case MPOL_BIND: ... case MPOL_INTERLEAVE: ... }; statements or if (policy == MPOL_INTERLEAVE) { ... } statements. Such applications would need to use optional mode flags when calling set_mempolicy() or mbind() for these previously implemented statements to stop working. If an application does start using optional mode flags, it will need to mask the optional flags off the policy in switch and conditional statements that only test mode. An additional member is also added to struct shmem_sb_info to store the optional mode flags. [hugh@veritas.com: shmem mpol: fix build warning] Cc: Paul Jackson Cc: Christoph Lameter Cc: Lee Schermerhorn Cc: Andi Kleen Signed-off-by: David Rientjes Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/shmem.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) (limited to 'mm/shmem.c') diff --git a/mm/shmem.c b/mm/shmem.c index d8ef7ba831a5..1ccf794fbe61 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1080,9 +1080,10 @@ redirty: #ifdef CONFIG_NUMA #ifdef CONFIG_TMPFS static int shmem_parse_mpol(char *value, unsigned short *policy, - nodemask_t *policy_nodes) + unsigned short *mode_flags, nodemask_t *policy_nodes) { char *nodelist = strchr(value, ':'); + char *flags = strchr(value, '='); int err = 1; if (nodelist) { @@ -1093,6 +1094,8 @@ static int shmem_parse_mpol(char *value, unsigned short *policy, if (!nodes_subset(*policy_nodes, node_states[N_HIGH_MEMORY])) goto out; } + if (flags) + *flags++ = '\0'; if (!strcmp(value, "default")) { *policy = MPOL_DEFAULT; /* Don't allow a nodelist */ @@ -1122,6 +1125,8 @@ static int shmem_parse_mpol(char *value, unsigned short *policy, *policy_nodes = node_states[N_HIGH_MEMORY]; err = 0; } + if (flags) { + } out: /* Restore string for error message */ if (nodelist) @@ -1130,7 +1135,7 @@ out: } static void shmem_show_mpol(struct seq_file *seq, unsigned short policy, - const nodemask_t policy_nodes) + unsigned short flags, const nodemask_t policy_nodes) { char *policy_string; @@ -1199,13 +1204,13 @@ static struct page *shmem_alloc_page(gfp_t gfp, #else /* !CONFIG_NUMA */ #ifdef CONFIG_TMPFS static inline int shmem_parse_mpol(char *value, unsigned short *policy, - nodemask_t *policy_nodes) + unsigned short *mode_flags, nodemask_t *policy_nodes) { return 1; } static inline void shmem_show_mpol(struct seq_file *seq, unsigned short policy, - const nodemask_t policy_nodes) + unsigned short flags, const nodemask_t policy_nodes) { } #endif /* CONFIG_TMPFS */ @@ -1578,7 +1583,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev) inode->i_op = &shmem_inode_operations; inode->i_fop = &shmem_file_operations; mpol_shared_policy_init(&info->policy, sbinfo->policy, - &sbinfo->policy_nodes); + sbinfo->flags, &sbinfo->policy_nodes); break; case S_IFDIR: inc_nlink(inode); @@ -1592,7 +1597,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev) * Must not load anything in the rbtree, * mpol_free_shared_policy will not be called. */ - mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, + mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, 0, NULL); break; } @@ -2209,7 +2214,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo, goto bad_val; } else if (!strcmp(this_char,"mpol")) { if (shmem_parse_mpol(value, &sbinfo->policy, - &sbinfo->policy_nodes)) + &sbinfo->flags, &sbinfo->policy_nodes)) goto bad_val; } else { printk(KERN_ERR "tmpfs: Bad mount option %s\n", @@ -2261,6 +2266,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) sbinfo->max_inodes = config.max_inodes; sbinfo->free_inodes = config.max_inodes - inodes; sbinfo->policy = config.policy; + sbinfo->flags = config.flags; sbinfo->policy_nodes = config.policy_nodes; out: spin_unlock(&sbinfo->stat_lock); @@ -2282,7 +2288,8 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs) seq_printf(seq, ",uid=%u", sbinfo->uid); if (sbinfo->gid != 0) seq_printf(seq, ",gid=%u", sbinfo->gid); - shmem_show_mpol(seq, sbinfo->policy, sbinfo->policy_nodes); + shmem_show_mpol(seq, sbinfo->policy, sbinfo->flags, + sbinfo->policy_nodes); return 0; } #endif /* CONFIG_TMPFS */ @@ -2313,6 +2320,7 @@ static int shmem_fill_super(struct super_block *sb, sbinfo->uid = current->fsuid; sbinfo->gid = current->fsgid; sbinfo->policy = MPOL_DEFAULT; + sbinfo->flags = 0; sbinfo->policy_nodes = node_states[N_HIGH_MEMORY]; sb->s_fs_info = sbinfo; -- cgit v1.2.3